Acidic and alkaline solutions

Question 1

What do acids produce in aqueous solutions

Answer 1

H+ Ions HCl(aq) → H+(aq) + Cl-(aq)

Question 2

Acidic solutions have a ph of 7 and what

Answer 2

Less than 7

Question 3

What do alkalis form

Answer 3

alkaine solutions in water produce hydroxide ions, OH- in aqueous solution

NaOH(aq) → Na+(aq) + OH-(aq)

Question 4

Alkaline solutions have a ph of what?

Answer 4

Greater than 7

Question 5

A
neutral
solution is neither acidic, nor alkaline. A neutral solution has a pH value of

Answer 5

7

Question 6

What does a PH SCALE INDICATE

Answer 6

the acidity or alkalinity of a solution

Question 7

Indicator

Answer 7

Indicator Acidic Neutral Alkaline
Red litmus paper Stays red Stays red Turns blue
Blue litmus paper Turns red Stays blue Stays blue

Question 8

What is a base

Answer 8

any substance that reacts with an acidto form a salt and water only

Question 9

Explain why all alkalis are bases, but not all bases are alkalis.

Answer 9

Alkalis are soluble bases, but only some bases are soluble in water, so these are not alkalis.

Question 10

Zinc oxide reacts with hydrochloric acid to form zinc chloride and water. Zinc oxide is insoluble in water. State and explain whether zinc oxide is a base, an alkali, or both.

Answer 10

Zinc oxide is a base, because it reacts with an acid to form a salt and water. It is not an alkali because it does not dissolve in water.

Question 11

What is a neutralisation reaction

Answer 11

Reaction between acid and base

Question 12

KEY PARTS

Answer 12

acids in solution are sources of hydrogen ions
, H+ alkalis in solution are sources of hydroxide ions, OH-

Question 13

In acid-alkali neutralisation reactions, hydrogen ions from the acid react with hydroxide ions from the alkali:

Answer 13

H+(aq) + OH-(aq) → H2O(l)

Question 14

When acids react with metals , the products are a salt and hydrogen. In general:

Answer 14

Acid + metal → salt + hydrogen

Question 15

Name the two products of the reaction of zinc with hydrochloric acid.

Answer 15

zinc chloride and hydrogen.

Question 16

Name the products of the reaction between zinc and sulfuric acid, and write an equation for the reaction.

Answer 16

The products are zinc sulfate and hydrogen.

H2SO4(aq) + Zn(s) → ZnSO4(aq) + H2(g)