Name: Section: Pre-lab Questions 1. Calculate the molar mass of KHP 2. Calculate

Question

Name: Section: Pre-lab Questions 1. Calculate the molar mass of KHP 2. Calculate the mass of NaOH required to prepare 400.0 mL, 1.0 M solution 3. Estimate the amount of 1.0 M NaOH (in mL) required to neutralize 5.0 g of KHI IP. 4. Given your previous experience with sodium hydroxide, why is it a good idea to standardize NaOH solutions, even if they were prepared using solid NaOH? 5. How will you know when all of the acid has been neutralized by the sodium hydroxide? 6. The concentration of a sulfuric acid solution isn't known, so it's titrated with an aqueous solution containing 3.00 g of sodium hydroxide. It took 22.8 ml. of sulfuric acid solution to neutralize the base. a) Write a balanced equation (with phases) for the reaction that's taking place b) How many moles of sodium hydroxide were present? c) How many moles of sulfuric acid must have been present? d) What is the concentration of the acid solution?

Explanation / Answer

Ans 1 :

KHP is potassium hydrogen pthalate.

Its chemical formula is C8H5KO4

The molar mass of the compound can be determined by adding the molar masses of the elements involved.

So here :

= 8(12.01) + 5(1.008) + 39.09 + 4(15.999)

= 204.22 g/mol

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