copper as amount with since careful attention to the procedure the amount the sh

Question

copper as amount with since careful attention to the procedure the amount the should have copper we started with during each step of the cycle of reactions. Practicing standard chemical techniques: quantitative transfers by decanting a supernat 1 romnletion of series of reactions. 1. 24.60 mL of 0.185 M HNo, are titrated with 27.3 mL of a KoH solution. What is the molarity of the KOH? 2.7 3 2. 0.280 gram of KOH will just neutralize what volume of 0.200 M Hizso4? 1/2 7 mole- rato 2.5 mL 0.750 gram of a sample of commercial lye is dissolved in water and titrated with 32.00 mL of .500 M HCI. What is the percent purity (the active ingredient in Lye is NaoH) of this sample?

Explanation / Answer

1) HNO3 + KOH ----------------->: KNO3 + H2O

millimoles of HNO3 = 24.60 x 0.185 = 4.551

4.551 millimoles KOH must be added to reach equivalence point

4.551 = 27.35 X M

M = 0.166 M

molarity of KOH = 0.166 M

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