Ph Calculation

The hydrogen ion concentration of a 10^-8 M HCl aqueous solution at 298 K (K_w = 10^-14) is:

1.

2.

3.

4.

The pOH of a solution at 25 °C that contains 1\times 10^-10 M of hydronium ions is:

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H⁺ ion concentration in the mixture?
1. $1.11\backslash times{10}^{-4}$ $\mathrm{M}$
2. $3.7\backslash times{10}^{-4}$ $\mathrm{M}$
3. $3.7\backslash times{10}^{-3}$ $\mathrm{M}$
4. $1.11\backslash times{10}^{-3}$ $\mathrm{M}$

What is the [OH^-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)₂?

1. 0.10 M

2. 0.40 M

3. 0.0050 M

4. 0.12 M

Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?

When equal volumes of 0.1 M NaOH and 0.01 M HCl are mixed, the pH of the resulting solution will be:

The following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:

A) $60$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $40$ $mL$ $\frac{M}{10}NaOH$

B) $55$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $45$ $mL$ $\frac{M}{10}NaOH$

C) $75$ $mL$ $\frac{M}{5}HCl$ $$ $+$ $25$ $mL$ $\frac{M}{5}NaOH$

D) $100$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $100$ $mL$ $\frac{M}{10}NaOH$

Which of them will have a pH equal to 1?

1. B
2. A
3. D
4. C