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Edexcel Chemistry 2017 > C8 Acids And Alkalis > Flashcards

C8 Acids And Alkalis Flashcards

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1
Q

State the pH of a strong acid, strong alkali and neutral solution

A

1,14,7

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2
Q

State three different indicators.

A

Litmus paper, universal indicator, methyl orange, phenolphthalein.

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3
Q

Identify the indicator which turns pink in shampoo.

A

Shampoo is alkaline, phenolphthalein

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4
Q

State the polyatomic ion formed when sulphuric acid dissociates.

A

SO4 2-

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5
Q

The ____________ the pH the higher the concentration of hydrogen ions in solution.

A

Lower

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6
Q

If the concentration of hydrogen ions increases by 1000 fold and the end result was pH 2, what pH did the first solution have?

A

1000 fold increase = 3 steps on the pH scale… pH5

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7
Q

True or false there are no ions present in pH7 pure water.

A

False thee are equal numbers of hydroxide and hydrogen ions at low concentrations

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8
Q

Strong acids…

A

Fully dissociate

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9
Q

Weak acids…

A

Partially dissociate

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10
Q

Name 3 strong acids

A

Hydrochloric, metric, sulphuric

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11
Q

Name 3 weak acids

A

Boric, carbonic, ethanoic.

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12
Q

Tin oxide is a base, describe how you would make tin chloride in a neutralisation reaction.

A

Mix excess tin oxide with hydrochloric acid, filter off excess. Rinse filter paper with distilled water, heat tin chloride solution in evaporating dish.

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13
Q

Why is it critical to use excess copper oxide when making copper sulphate crystals in a neutralisation reaction?

A

So that all of the acid is neutralised.

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14
Q

Nitrate ion

A

NO3 -1

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15
Q

Charge of a sulphate ion

A

SO4 2-

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16
Q

Charge of a carbonate ion

A

CO3 2-

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17
Q

Formula for sodium sulphate

A

Na2SO4

18
Q

___________________ acid is found in the stomach because…

A

Hydrochloric acid… Help digest food, kill bacteria.

19
Q

Titration are used when…

A

Making soluble salts and a know endpoint is needed.

20
Q

Why is universal indicator a poor choice for titrations?

A

It doesn’t have a sharp end point like methyl orang of phenolphthalein

21
Q

Acid and limestone —>

A

Make salt, water and carbon dioxide

22
Q

Ionic equation for dissociation of ethanoic acid.

A

CH3COOH –> CH3COO- + H+

23
Q

Ionic equation for magnesium carbonate and hydrochloric acid…

A

2H+ + CO32- —> H2O + CO2
Extra brownie points for state symbols.
Magnesium and chloride ions are spectators.

24
Q

Common Sodium, potassium and ammonium salts tend to be…

A

Soluble

25
Q

All __________ are soluble

A

Nitrates

26
Q

Potassium chloride, silver chloride, lead chloride… Odd one out

A

Potassium chloride is soluble

27
Q

Name two suitable reagents to make barium sulphate in a precipitate reaction.

A

Barium nitrate, potassium/sodium/ammonium sulphate is the obvious choice :-)

28
Q

Turns limewater from colourless to cloudy…

A

Carbon dioxide.

29
Q

Charge on a hydroxide ion

A

-1

30
Q

Pipettes are used in titrations instead of measuring cylinders because…

A

They provide a more accurate and repeatable means of measuring out a know volume of liquid.

31
Q

Dodgy titration, how do you ensure your result is reliable?

A

Repeat your experiment.

32
Q

A student has 100ml of sodium hydroxide solution, it is neutralised in a titration by 25ml of an acid stock. What does this tell you about the acid?

A

The concentration of the acid is 4 times greater in magnitude.

33
Q

What did the police officer say to the acid who hit an alkali?

A

That’s assault!

34
Q

It’s all about the base, bout the base…

A

No acid.

35
Q

If your not part of the solution…

A

Your part of the precipitate.

36
Q

What’s effervescence? When might you see it in this topic?

A

Bubbles! Bubbles! CASHOCO reactions, MASH reactions.

37
Q

25g of sulphuric acid is dissolved into 200cm3 of water, what’s the concentration?

A

0.125g/cm3

38
Q

Write the formula and state symbol for a saline solution.

A

NaCl (aq)

39
Q

Describe a concentrated acid

A

Large number of hydrogen ions in a proportionally small volume.

40
Q

Describe a strong acid

A

An acid which is a strong proton donor and reliably dissociates with high percentage of success.

Edexcel Chemistry 2017 (1 decks)

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