Question

Calculate [H+] for each of the following solutions, and indicate whether the solution is acidic, basic, or neutral. 1.[OH−]= 8.0×10−9 M . Express your answer using two significant figures. 2.A solution in which [OH−] is 100 times greater than [H+]. Express your answer using two significant figures. Can someone show every step to do this by,

Answer 1

1.[OH⁻]= 8.0×10⁻⁹ M

Since,

[H⁺] [OH^-] = 1.0 x 10^-14

$\Rightarrow$[H⁺] = (1.0 x 10^-14) / [OH^-]

$\Rightarrow$[H⁺] = (1.0 x 10^-14) / (8.0×10⁻⁹)

$\Rightarrow$[H⁺] = 1.25 x 10^-6

$\Rightarrow$[H⁺] = 1.3 x 10^-6

2. [OH^-]= 100 [H⁺]

[H⁺][OH^-] = 1.0 x 10^-14

[H⁺] x 100 [H⁺] = 1.0 x 10^-14

100 [H⁺]² = 1.0 x 10^-14

[H⁺]² = 1.0 x 10^-16

[H⁺] = $\sqrt{}$(1.0 x 10^-16) =1.0 x 10^-8 M