Question

The four chemistry friends Kemmi, Doc, Stu, and Noke perform a standardization of sodium hydroxide solution using potassium hydrogen phthalate (KHP) and the procedure described in Lab 1 of this Module. Use Doc Inmaking’s data to help him perform each step of the calculations over the next six questions. Doc weighs 2.9842 g of potassium hydrogen phthalate solid for his titration. Calculate the moles of potassium hydrogen phthalate he used. (Answer to 5 significant figures, units of mol. Hint: the molar mass of potassium hydrogen phthalate is given in the Introduction of the Module.)

Answer 1

0.014628 moles of potassium hydrogen phthalate

Explanation:

We know the mass of the potassium hydrogen phthalate and to calculate the number of moles we use the following formula:

number of moles = mass / molecular wight

molecular wight of potassium hydrogen phthalate (C₈H₅KO₄) = 204 g/mole

number of moles of potassium hydrogen phthalate = 2.9842 g / 204 (g/mole)

number of moles of potassium hydrogen phthalate = 0.014628 moles (5 significant figures)

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