4 Chemical Changes - Acids Flashcards

1
Q

Define acid in terms of pH

A

A substance with a pH of less than 7

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2
Q

Define acids in terms of ions

A

A substance which releases H+ ions in solution

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3
Q

What does (aq) stand for?

A

Aqueous: when something is dissolved in water. E.g. NaCl(aq) is salt water

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4
Q

State the three common acids and give their formulae

A

Hydrochloric acid, HCl(aq), Sulphuric acid, H2SO4(aq), Nitric acid, HNO3

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5
Q

Which ions do the common acids form in solution?

A

HCl forms H+ and Cl-, H2SO4 forms 2H+ and SO4 2-, HNO3 forms H+ and NO3-

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6
Q

What is a neutral solution?

A

A solution with a pH of 7. Water is an example.

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7
Q

How do you measure pH?

A

With an indicator or pH probe.

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8
Q

What is a base?

A

A metal oxide, hydroxide or carbonate that will react with an acid. E.g. copper oxide

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9
Q

What is an alkali?

A

A soluble base. E.g. sodium hydroxide

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10
Q

Which ions are always present in a solution of an alkali?

A

OH?

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11
Q

What is a salt?

A

A compound formed when some or all of the hydrogen from an acid is replaced by a metal. E.g. CuSO?, copper sulphate, where copper has replaced H from H?SO?

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12
Q

What type of salts are formed by the three main acids?

A

Hydrochloric acid produces chlorides, sulphuric acid = sulphates, nitric acid = nitrates

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13
Q

What is a neutralisation reaction?

A

A reaction involving an acid that results in a neutral solution

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14
Q

Which ions always react together in a neutralization reactions between acids and alkalis?

A

H? and OH?

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15
Q

Write the equation showing the reaction between H? and OH? ions

A

H+ + OH- gives H2O

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16
Q

metal + acid ?

A

gives salt + hydrogen gas

17
Q

metal hydroxide + acid ?

A

gives salt + water

18
Q

metal oxide + acid ?

A

gives salt + water

19
Q

metal carbonate + acid ?

A

gives salt + water + carbon dioxide

20
Q

How do you make a soluble salt from an acid?

A

React the acid with a base. E.g. to make copper sulphate react copper oxide with sulphuric acid

21
Q

If a salt is in solution, how do you extract it as a solid?

A

Allow the water to evaporate off and it will leave the salt behind as a solid.

22
Q

What is a strong acid?

A

An acid which completely splits up into its ions in water. E.g. when HCl is in water all the HCl molecules split up into H? and Cl?

23
Q

What is a weak acid?

A

An acid which will have some molecules which do not split up into their ions. E.g. in ethanoic acid only some of the molecules will have split up into the ethanoate ion and H? ions.

24
Q

What is the relationship between the strength of an acid and its pH?

A

As an acid increases in strength the pH decreases.

25
Q

What is a concentrated acid?

A

An acid where there are lots of acid particles in the water.

26
Q

What is a dilute acid?

A

An acid where there are fewer acid particles in the water.

27
Q

How is pH measured?

A

pH is related to the concentration of H? in a solution.