Question

7) In a basic solution, pH is A) > 7. <1 x 10-7 M B and [H3O+] is ) < 7, < 1 x 10-7 M C) < 7,> 1 x 10-7 M D) = 7, 1 x 10-7 M B) Colete the tend the prof021 MUA.

Answer 1

We know that

i) when pH is less than 7, then solution will be acidic

lesser the pH , higher will be acidity

ii) when pH is equal to 7 then solution will be negative

the H₃O⁺ ion concentration of neutral solution is always 1 $\times$ 10^-7 M

iii) when pH is greater than 7 then solution will be Basic

higher the pH indicates higher the basicity

'it means , we got

in a Basic solution , pH is greater than 7 that is pH > 7

Now we know that

pH = -log[H⁺]

if we take

[H⁺] = 1 $\times$ 10^-7 M then pH will be 7 which is neutral

if we take

[H⁺] greater than 1 $\times$ 10^-7 M, for example we will take

[H⁺] = 1 $\times$ 10^-6 M which is greater than  1 $\times$ 10^-7 M , the resulting pH = 6 which is Acidic and so on for [H⁺] greater than 1 $\times$ 10^-7 M

if we take

[H⁺] less than 1 $\times$ 10^-7 M , for exmple , we will take

[H⁺] less than 1 $\times$ 10^-8 M which is less than 1 $\times$ 10^-7 M , the resulting pH = 8 which is Basic and so on for [H⁺] less than 1 $\times$ 10^-7 M

hence

in Basic solution [H₃O⁺] < 1 $\times$ 10^-7 M

so the our answer is option A)

in a Basic solution pH is > 7 and [H₃O⁺] is < 1 $\times$ 10^-7 M