Question

If a base is added to water, what will occur?

hydronium ion concentration is increased.
hydroxide ion concentration is decreased.
[H+] is decreased.
[OH-] is decreased.

Answer 1

C

Step-by-step explanation:

The first and most obvious statement is that [OH-] is increased, but that is not offered to you.

The second most obvious statement is that the [H+] ion is decreased. That is offered to you. It is C

Answer 2

[H+] is decreased.

Step-by-step explanation:

Arrhenius Theory:

An acid is a substance which produces one or more hydrogen ions, (H+) in aqueous solution.

Examples:

`HCl(aq)>H^+(aq)+Cl^-(aq)\\\\HBr(aq)>H^+(aq)+Br^- (aq)\\\\H_2 SO_4(aq)>2H^+(aq)+SO_4^2- (aq)\\\\H_3 PO_4(aq) >3H^+ (aq)+PO_4^3-(aq)\\\\CH_3 COOH(aq)>CH_3 COO^- (aq)+H^+ (aq)`

A Base is a substance which produces one or more hydroxyl ion or hydroxide ion (OH-) in aqueous solution.

Examples

`NaOH(s)>Na^+ (aq) + OH^- (aq)\\\\KOH(s)>K^+ (aq) +OH^- (aq)\\\\Ca(OH)_2 (s)>Ca^(2+) (aq)+2OH^-(aq)\\\\Al(OH)_3 (s)> Al^(3+)(aq)+ 3OH^- (aq)`

Please note:

(aq) stands for aqueous which means in the presence of water that is, water acts as a solvent

So, on adding a base to the water increase in
`[OH^-]` will take place and this will decrease the Hydrogen ion concentration

Pure water contains
`[H^+]=[OH^-]`

if the solution is acidic
`[H^+ ]>[OH^- ]`

if the solution is Basic
`[H^+ ]<[OH^- ]`