Question

A 0.10 M HCl solution has a pH of 1.00. A 0.10 M NaOH solution has a pH of 13.00. A 1.0 L solution in which 0.010 moles of compound Z is dissolved has a pH of 12.00. Compound Z is a

strong acid

strong base

weak acid

weak base

Answer 1

basic solution have pH greater than 7

This is strong base because:

we have below equation to be used:

pH = -log [H+]

12 = -log [H+]

log [H+] = -12

[H+] = 10^(-12)

[H+] = 1*10^-12 M

we have below equation to be used:

[OH-] = Kw/[H+]

Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC

[OH-] = (1.0*10^-14)/[H+]

[OH-] = (1.0*10^-14)/(1*10^-12)

[OH-] = 1*10^-2 M

Which is what we added

So, the compound has dissociated completely

Answer: strong base