0.0683 M silver nitrate solution. The initial buret reading was 1.26 mL. At the
ID: 700779 • Letter: 0
Question
0.0683 M silver nitrate solution. The initial buret reading was 1.26 mL. At the first evidence of the red endpoint, the buret read 13.89 mL. Find the concentration of the iodide in the original solution. Express the final result also as a percentage (w/v) of calcium iodide in the solution. ANSWER: 0.254% Caly What mass of Fe-Os would you expect from a gravimetric analysis of a sample that contains 0.257 mol of iron? 3. ANSWER 20.5g Fe 4. What is the concentration of Ni+ in units of molarity in a solution if exactly 10.00 mL of this solution gave 0.0658 grams of nickel dimethylglyoximate assuming the reaction proceeds essentially 100% to completion. ANSWER: 0.0228 M 5. What is the percent silver in a piece of metal that has a mass of 0.06978 grams and requires 23.98 mL of 0.02654 M KCI to reach the endpoint in the Mohr method? ANSWER 98.38% (w/w) A calibration mass is made of an unknown metal. A student wished to find the density of the metal as a means of identifying it. To accomplish this task, the mass was taken using an analytical balance. The weighing boat had a mass of 1.5487 +1- 0.0002 grams. The mass of the metal and the weighing boat was 97.6253 +-0.0002 grams. Next, the volume was measured by displacement. A graduated cylinder was used to measure the water placed into a container in order to fill it to the top. The container held 94.56 +/-0.03 mL). The metal was dropped into the container, and the displaced water was allowed to escape. Afterwards the same graduated eylinder was used to measure the remaining water. 48.56 +/-0.03 mL of water were still in the container. Find the density of the metal. 6.Explanation / Answer
Ans 4
Nickel(II) dimethylglyoxime
Molecular Formula = C8H16N4NiO4
Molecular weight = 290.933 g/mol
For 100% completion
Moles of C8H16N4NiO4 = mass/molecular weight
= 0.0658 g / 290.933 g/mol
= 0.000226 mol
Molarity = moles of solute / volume of solution
= 0.000228mol / 0.010L
= 0.0228 M
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.