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RGS 5th Form Chemistry CH-F > 2 Making Salts > Flashcards

2 Making Salts Flashcards

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1
Q

In the precipitation method, Two salts are added to make an insoluble salt.

What must be done to the two salts which are added together?

A

The two soluble salts must be dissolved in water so that their ions are dissociated (in solution)

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2
Q

In the precipitation method, Two soluble salts are added together to form an insoluble salt.

Which two salts can be used to make copper carbonate?

A

copper nitrate AND sodium carbonate

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3
Q

In the titration method we must titrate until we acheve concordant results. What does this mean?

A

At least two titres which are within 0.2 cm3 of each other.

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4
Q

In the precipitation method, Two soluble salts are added together to form an insoluble salt.

Which two salts can be used to make barium sulfate?

A

Barium nitrate AND sodium sulfate

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5
Q

What is the chemical formula and valency of a carbonate ion?

A

CO32-

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6
Q

In the titration method we must titrate until we acheve concordant results. What is the significance of the mean of the concordant results?

A

This is the exact volume of acid/alkali needed to neutralise and form a pure salt solution.

Pure crystals of the salt can then be formed from this solution

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7
Q

In the precipitation method, Two soluble salts are added together to form an insoluble salt.

Which two salts can be used to make calcium sulfate?

A

calcium nitrate AND sodium sulfate

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8
Q

Which of the following salts are soluble?

Na2O

KOH

(NH4)2CO3

A

All of them!

All oxides, hydroxide and carbonate salts are INSOLUBLE except for sodium, potassium and ammonium salts.

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9
Q

In the titration method we must titrate until we acheve concordant results. What do we do with these concordant results?

A

We find the mean of the concordant results.

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10
Q

In the titration method we must titrate until we acheve concordant results. Why do we use both a burette and pipette during titration?

A

Both a pipette and burette allow us to read volumes of solution to a small uncertainty. Making our reading accurate.

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11
Q

Which of the following salts are soluble?

BaSO4

CaSO4

PbSO4

A

None of them!

All sulphates salts are soluble except for Barium (Ba2+), calcium (Ca2+) or lead (Pb2+)

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12
Q

In the insoluble base method a base is added to a hot acid. What is kept to make the pure sample of the salt?

filtrate OR residue

A

filtrate

The residue is the excess base added

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13
Q

What is the chemical formula and valency of a iron ion?

A

Fe2+ OR Fe3+

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14
Q

What is the chemical formula and valency of a silver ion?

A

Ag1+

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15
Q

What is the solubility rules for halide salts?

Cl-, Br- and I-

A

All halide salts are SOLUBLE - except for silver (Ag+) and lead (Pb2+)

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16
Q

What is the chemical formula and valency of a lead ion?

A

Pb2+

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17
Q

What soluble salts could be used to make lead iodide by the precipitation method

A

lead nitrate

sodium iodide

HINT: You can always choose a nitrate and sodium salt as all nitrate salts are soluble and all sodium salts are soluble

lead nitrate + sodium iodide ⇒ lead iodide + sodium nitrate

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18
Q

In the precipitation method, Two soluble salts are added together to form an insoluble salt.

Which two soluble salts could be used to make lead iodide?

A

Lead nitrate AND sodium iodide

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19
Q

What are the two questions which you need to answer when determining which method is needed to make a salt?

A
  1. Is the salt soluble or insoluble?
  2. Is it a sodium, potassium or ammonium salt?
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20
Q

Add state symbols to the chemical equation below

Lead nitrate + sodium sulfate ⇒ lead sulfate + sodium nitrate

Pb(NO3)2 + Na2SO4 ⇒ PbSO4 + 2NaNO3

A

Pb(NO3)2 (aq)+ Na2SO4 (aq) ⇒ PbSO4 (s) + 2NaNO3 (aq)

PbSO4 is the precipitate

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21
Q

In the insoluble base method a base is added to a hot acid. Why must the hot acid be stirred each time the base is added?

A

The ensure a complete reaction between the base and acid

22
Q

In the precipitation method, How is the pure salt obtained from the products?

A

The insoluble pure salt is filtered out as the residue

This residue must be wased with distilled water and allowed to dry.

23
Q

In the precipitation method, two soluble salts are added together. Why must you stir after they are added together?

A

The ensure that the reaction is complete

24
Q

What is the chemical formula and valency of a zinc ion?

A

Zn2+

25
Q

Which of the following salts are soluble?

PbCl2

AgBr

PbI2

A

None of them!

All halides are soluble except for lead (Pb2+) and silver (Ag+) halides!

26
Q

What is the chemical formula and valency of an ammonium ion?

A

<span>NH</span>41+

27
Q

In the insoluble base method a base is added to a hot acid. How are pure crystals of salt produced from the filtrate?

A
  1. The filtrate is heated to half volume in an evaporation basin
  2. Allowed to cool and crystals form
  3. Filter our crystals and allow to dry
28
Q

In the titration method we must titrate until we acheve concordant results. How do you know when the acid and alkali have exactly neutralised?

A

An indicator is used, a colour change indicates that neutralisation has been reached- there are equal H+ and OH- ions.

29
Q

Which of the following salts are soluble?

Pb(NO3)2

Ca(NO3)2

CuNO3

A

All of them!

All nitrate (NO31-) salts are soluble

30
Q

What are the rules for writing ionic equations?

A
  1. Dissociate or break apart any substance into its ions which is aqueous (aq)
  2. Leave any substance which is liquid (l), solid (s) or gas (g) - do not break them apart into ions (They do not form ions)
  3. Cross out any ions which are the same on both sides of the reaciton - These are called spectator ions!
  4. Rewrite the equation without the spectator ions
31
Q

To determine which method to use when making a salt you should answer the following questions

  1. Is the salt soluble?

YES - ask yourself question 2 NO - U_se precipitation method_

2. Is the salt a sodium, potassium or ammonium salt?

YES - Use titration method NO - Use insoluble base method

Use this to determine how to make potassium sulfate

A

potassium sulfate

  1. Is the salt soluble? YES- all sulfates are soluble except for Ba, Ca and Pb

YES - ask yourself question 2 NO - Use precipitation method

  1. Is the salt a sodium, potassium or ammonium salt? YES= potassium salt!

YES - Use titration method NO - Use insoluble base method

32
Q

What is the solubility rules for hydroxide salts?

OH-

A

All hydroxide (OH-) salts are INSOLUBLE - except for sodium (Na+), potassium (K+) or ammonium (NH41+)

33
Q

In which salt preparation method do we add an acid to an alkali?

ACID + ALKALI

A

Titration method

34
Q

What is the solubility rules for sulfate salts?

SO42-

A

All sulfate salts are SOLUBLE - except for calcium (Ca2+), barium (Ba2+) and lead (Pb2+)

35
Q

What is the formula for ammonium carbonate?

A

NH4+ CO32-

Cross and drop valencies

(NH4)2CO3

36
Q

Which two types of salts are ALWAYS SOLUBLE

A

All nitrate salts (NO31-) are soluble

All sodium, potassium and ammonium salts are soluble

(Na+, K+ and NH41+)

37
Q

In which salt preparation method do we add a base to an acid?

ACID + BASE

A

Insoluble base method

38
Q

To determine which method to use when making a salt you should answer the following questions

  1. Is the salt soluble?

YES - ask yourself question 2 NO - U_se precipitation method_

2. Is the salt a sodium, potassium or ammonium salt?

YES - Use titration method NO - Use insoluble base method

Use this to determine how to make Lead iodide

A

Lead iodide

  1. Is the salt soluble - No - all halides are soluble except for silver and lead

YES - ask yourself question 2 NO - Use precipitation method

39
Q

What is the chemical formula and valency of a copper ion?

A

Cu2+ OR Cu1+

40
Q

In which salt preparation method do we add a salt to a salt?

SALT + SALT

A

Precipitation method

Two soluble salts are added together to form an insoluble salt

41
Q

In the insoluble base method a base is added to a hot acid. How do you know that all the acid has reacted and a pure solution of salt has been acheived?

A

When some base is left in the bottom of the beaker which will not disappear (not react)

42
Q

What is the solubility rules for carbonate salts?

CO32-

A

All carbonate (CO32-) salts are INSOLUBLE - except for sodium (Na+), potassium (K+) or ammonium (NH41+)

43
Q

In the titration method we must titrate until we acheve concordant results. Why do then repeat the titration without an indicator?

A

To make a pure sample of the salt without indicator

44
Q

To determine which method to use when making a salt you should answer the following questions

  1. Is the salt soluble?

YES - ask yourself question 2 NO - U_se precipitation method_

2. Is the salt a sodium, potassium or ammonium salt?

YES - Use titration method NO - Use insoluble base method

Use this to determine how to make copper sulfate

A

Copper sulfate

  1. Is the salt soluble?- YES - All sulphates are soluble except for Ca, Ba and Pb

YES - ask yourself question 2 NO - Use precipitation method

  1. Is the salt a sodium, potassium or ammonium salt? NO

YES - Use titration method NO - Use insoluble base method

45
Q

What is the chemical formula and valency of a sulfate ion?

A

SO42-

46
Q

In the titration method we must titrate until we acheve concordant results. These volumes are averaged and then this volume of acid/alkali are added without an indicator. This solution is now a pure salt solution. How are the pure crystals obtained from this solution?

A
  1. The salt solution is heated to half volume in an evaporating dish
  2. The solution is cooled and crystals form
  3. These crystals are filtered out and allowed to dry
47
Q

In the insoluble base method, why must the base be added in excess?

A

To ensure that all the acid has reacted leaving a pure salt solution and excess solid base which can be removed by filtering

48
Q

In the insoluble base method, why must the acid be heated?

A

To speed up the rate of reaction between the base and acid.

49
Q

What is the chemical formula and valency of a nitrate ion?

A

NO31-

50
Q

Which of the following salts are soluble?

NaBr

KNO3

NH4CO3

A

They are all soluble - All Na+, K+ and NH4+salts are soluble

NaBr

KNO3

NH4CO3

51
Q

What is the solubility rules for oxide salts?

A

All oxide (O2-)salts are INSOLUBLE - except for sodium (Na+), potassium (K+) or ammonium (NH41+)

RGS 5th Form Chemistry CH-F (10 decks)

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