Question

UU ANITOUESTIONS EXPERIMENT 10 PRE-LABORATORY STANDARDIZATION OF A SODIUM HYDROXIDE SOLUTION NAME DATE 1. What is the purpose of this experiment? 2. A sample of KHP has a mass of 2.345 g is used for a titration, how many moles of KHP is this sample? 3. How many moles of NaOH would be needed to reach the endpoint of this titration with sample of KHP from the previous question? 4. If the initial volume of the NaOH in the burette was 0.50 ml and the final volume is shown to the right, what is the volume of NaOH used in this titration? 5. What is the concentration of the NaOH solution used in this titration? EXPERIMENT 10 155

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Answer 1

Pre lab questions:

1. To determine the concentration of NaOH solution

2. Molar mass of KHP = 204.22 g/mol

Number of Moles of KHP = mass/molar mass = 2.345(g)/204.22 (g/mol) = 0.0114827 mol

3. 1 mole NaOH reacts with 1 mole KHP

Number of moles of NaOH that would be needed to react with 0.0114827 moles of KHP = 0.0114827 moles

4. Volume of NaOH used for this titration= final reading-initial reading = 18.80 mL - 0.50 mL = 18.30 mL = 0.0183 L

5. Number of moles of KHP used = 0.0114827 mol

Molarity of NaOH = number of moles of NaOH/volume of the solution

Molarity of NaOH = 0.0114827 mol/0.0183 L = 0.6275 M