BRIUM CONSTANT TION OF AN PRE-LABORATORY QUESTIONS The following preparatory que
ID: 959305 • Letter: B
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BRIUM CONSTANT TION OF AN PRE-LABORATORY QUESTIONS The following preparatory questions should be answered before coming to lab. The : are intended to introduce you to several ideas that are important to aspects of the experiment. You must turn in your work to your instructor before you will be : : allowed to begin the experiment Potassium acid phthalate, KHP (KHCsHaO4), is a primary standard reagent used to determine exactly the concentration of a solution of base, such as NaOH, whose approximate concent ration is known. KHP is a weak acid, and the equation for the neutralization of KHP IS COOK COOK + H20 + NaOH COONa COOH KHP Potassium acid Phthalate Ahmed Zuwail dissolved 0.38 grams of KHP in 50.0 mL of water. He found out that i required 17.5 mL of NaOH to reach the endpoint of the titration.Explanation / Answer
Henderson-Hasselbalch equation is pH = pKa+log(salt/acid)
From the given reaction it is clear that 1 mole of KHP reacts with 1 mole
pH = -log(3.89x 10-6)+log(1/1) = 5.41
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