1)Potassium permanganate (KMnO4) solutions are used for the determination of iro

Question

1)Potassium permanganate (KMnO4) solutions are used for the determination of iron in samples of unknown concentration. As a laboratory assistant, you are supposed to prepare 800. mL of a 0.800 M KMnO4 solution. What mass of KMnO4, in grams, do you need? 2)What is the molar concentration of a solution of sulfuric acid, H2SO4, if 7.94 mL react completely with 0.499 g of NaOH which was dissolved in 200 mL of water? 3)58.0 mL of 3.90 M sodium hydroxide is combined with 48.0 mL of 1.30 M magnesium chloride. What mass in grams of solid forms? 4)What is the molarity of a solution of calcium hydroxide, Ca(OH)2, if 389 mL is neutralized with 41.81 mL of a 0.257 M HCl 5)A solution is prepared by placing 29.5 g of KCl in a 0.900 L volumetric flask and adding water to dissolve the solid, then filling the flask to the mark. What is the molarity of an AgNO3 solution if 35.6 mL of the KCl solution react exactly with 39.0 mL of the AgNO3 solution?

Explanation / Answer

1)liters x molarity = moles

0.800 x 0.800 M = 0.640 moles of KMnO4
molar mass of KMnO4 = 158.04
g KMnO4 = 158.04 x 0.640 = 101 gram

2)H2SO4(aq) + 2NaOH(aq) ? Na2SO4(aq) + 2H2O(l)

Nacid

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