If filter paper weight was 1.268g and weight of precipitate+filter paper= 1.287g Calculate the concentration of zinc using the steps below. c. Calculate the moles of zinc in the zinc nitrate solution used.  d. Calculate the concentration of the zinc in the zinc nitrate solution. e. Confirm whether sodium phosphate was in excess. Using the concentration of the sodium phosphate solution used, determine how many moles were used and confirm it was the excess reagent.

A. A Set of Standard Solutions Data Analysis, A 16a mmin 16b B. Determination of max Identify the metal ion for analysis on the Report Sheet. 1. Prepare a stock solution. a. Prepare 100 mL of a 0.10 M stock solution. To do this, you will need to know the formula of the Cu²+, Ni²+, or Fe³+ ion-containing salt in order to calculate the mass of salt for its preparation. See Prelaboratory Assign- ment question 2a. Show a similar calculation for your selected metal ion on the Report Sheet. Measure the mass of the salt (±0.001 g). b. Transfer the salt to a 100-mL volumetric flask, half-filled with 0.01 M HNO3, add the appropriate complexing agent (see Table 35.1), and then dilute to the mark with 0.01 M HNO3. Record on the Report Sheet the exact molar concentration of the stock solution. Table 35.1 Volume of Complexing Agent for Stock Solution Preparation Metal Ion Volume of Complexing Agent Cu²+ 10 mL of conc NH, Ni²+ 10 mL of conc NH; Fe³+ 20 mL of 0.1 M NASCN 2. Prepare the standard…

True or False:

12. An unknown precipitate of sulfide from the Group II cations dissolves upon the addition of 20 drops of 3M KOH, this unknown cation may be a. Bismuth b. Tin с. Сорper d. Cadmium e. Iron