A solution of sodium hydroxide has a concentration of 0.010 M at 25 degrees Celsius. What is its pH?
Answer and explanation
Correct answer: B. 12.0
- Step 1: NaOH is a strong base, so [OH-] = 0.010 M and pOH = 2.0.
- Step 2: pH = 14 - 2.0 = 12.0.
Answer
12.0.
Why not the others: 2.0 is the pOH; 10.0 uses the wrong subtraction; 7.0 is neutral.
Practise more Equilibrium, Electrochemistry and Mole Calculations.
Free questions with an explanation for every one, and full timed Victorian VCE mock tests.
More Equilibrium, Electrochemistry and Mole Calculations questions
- A reaction at equilibrium is exothermic in the forward direction. What happens to the position of equilibrium when the temperature is raised…
- For N2(g) + 3H2(g) <=> 2NH3(g) at constant temperature, what is the effect of increasing the pressure by decreasing the volume?
- Which is the equilibrium constant expression for 2SO2(g) + O2(g) <=> 2SO3(g)?
- For H2(g) + I2(g) <=> 2HI(g), K = 50 at a certain temperature. A mixture has [H2] = 0.10 M, [I2] = 0.10 M and [HI] = 0.50 M. What will happe…
- A catalyst is added to a reaction at equilibrium. What is the effect?
- Argon gas is added to a closed container of a gaseous mixture at equilibrium, at constant volume and temperature. What is the effect on the…