What is the pH of a 0.001 mol/L solution of sodium hydroxide at 25 degrees Celsius?
Answer and explanation
Correct answer: B. 11
- Step 1: [OH-] = 10^-3, so pOH = 3. Step 2. pH = 14 - 3 = 11. Answer: 11. Why not the others: 3: That is the pH of a 0.001 mol/L strong acid. -3: That is the logarithm of the concentration. 1: That is not the pH for this concentration.
Practise more Acids, equilibrium and thermochemistry.
Free questions with an explanation for every one, and full timed CSAT Suneung mock tests.
More Acids, equilibrium and thermochemistry questions
- What is the pH of a 0.01 mol/L solution of hydrochloric acid, a strong acid?
- A solution has pH 3. By how much is its hydrogen ion concentration greater than that of a solution with pH 5?
- 25 mL of 0.1 mol/L HCl is exactly neutralised by NaOH solution of concentration 0.05 mol/L. What volume of NaOH is needed?
- According to Le Chatelier's principle, increasing the pressure on the equilibrium N2 + 3H2 <-> 2NH3 will
- For the reaction A + B <-> C the equilibrium concentrations are [A] = 0.2, [B] = 0.5 and [C] = 0.4 mol/L. What is the equilibrium constant K…
- In an exothermic reaction the enthalpy change, delta H, is