RATO .ould be answered before coming to lab. They ss that are important to aspec
ID: 1037544 • Letter: R
Question
RATO .ould be answered before coming to lab. They ss that are important to aspects of e PRE-LABORATORY Oour he following pintroduce you to several ideasan swered you to several ideas to are intended to experiment. You must turn in to lab. They ork to your instructor before you will be : The following preparatory questions t You must turn in your work to begin the experiment. are uthe HP (KHCsH0.), is a standard reagent used to determin KHP is a weak acid, and thH, whose a atmin hthalate, K rea base, such as NaOH, whose approximaic Potassiuthe concentr tration of a solution of ch eagent acid, and the equation for the neutralization of KHP the concentration of a solution ofprimary is known. by NaOH is COOK COOK +NaOH ?,o COOH COONa KHP Potassium acid Phthalate 1. Zack dissolved 0.28 grams of KHP in 15.0 mL of water. 8.5 mi, of NaOH to reach the endpoint of the titration. He found out that it required a. How many moles of the acid ???, were originally present before the addition of the 1 wis! Ist 204.22 b. Calculate the concentration of the NaOH solution? 0.074 CHEM1515-YEAR 2017-2018 9-1Explanation / Answer
Ka = 3.89 x 10^-6
pKa = -log (3.89 x 10^-6)
pKa = 5.41
At end point salt only remains.
salt concentration = 1.37 x 10^-3 / 0.015 + 0.018.5
= 0.0409 M
pH = 7 + 1/2 (pKa + log C)
= 7 + 1/2 (5.41 + log 0.0409)
pH = 9.01
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