Question

4)
• Which of the following solution is
most likely to liberate hydrogen on
reacting with zinc metal?
1.0 Marks
pH =1.8
pH=7
pH=5
pH=13???​

Answer 1

Answer:

a) D is neutral, as its pH value is equal to 7

b) C is strongly alkaline, as its pH value is 11.

c) B is strongly acidic, as its pH value is equal to 1

d) A is weakly acidic, as its pH value is equal to 4 and more than solution B.

e) E is weakly alkaline, as its pH value is equal to 9 and less than C.

pH value of the given solution in increasing order of hydrogen-ion concentration: 11<9<7<4<1

Answer 2

Answer:

The most likely solution to liberate hydrogen on reacting with zinc metal is a solution with a low pH. This is because zinc reacts with acids to produce hydrogen gas according to the following reaction:

Zn + 2H+ → Zn2+ + H2

Therefore, the solution with a pH of 1.8 is the most likely to liberate hydrogen on reacting with zinc metal.

Explanation:

When zinc metal reacts with an acid, such as hydrochloric acid, it produces hydrogen gas. This is an example of a single replacement reaction, in which the zinc metal (Zn) replaces the hydrogen ions (H+) in the acid to form zinc ions (Zn2+) and hydrogen gas (H2). The balanced chemical equation for this reaction is:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

The acidity of the solution affects the rate of this reaction. A low pH solution (i.e. acidic) will increase the concentration of hydrogen ions (H+) in the solution, making it more likely that zinc will react with the hydrogen ions to produce hydrogen gas.

Therefore, the solution with a pH of 1.8 is the most likely to liberate hydrogen on reacting with zinc metal, as it has a high concentration of hydrogen ions and is therefore more acidic than the other solutions listed.

In contrast, a solution with a high pH (i.e. basic) has a low concentration of hydrogen ions and is less likely to react with the zinc metal to produce hydrogen gas. Therefore, the solution with a pH of 13 is least likely to liberate hydrogen on reacting with zinc metal.

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