l goider i Mohawk Velley Community College Calculate the mass of silver in your
ID: 559811 • Letter: L
Question
l goider i Mohawk Velley Community College Calculate the mass of silver in your or iginal solder sample: you will need to take the ure into account in your calculation. Finally calculate the percent siliver in the sample. Pre-lab The following must be completed before lab.You will not be able to perform lab until complete. Points may be deducted by your instructor if it is late or incomplete. following questions in your lab notebook, and hand in the yellow sheet at the beginning of the this is Answer the laboratory period. What is meant by drying to constant weight, and why is it important to do so in this experiment? 1. A student collects 0.7295 grams of silver chloride in a procedure similar to this experiment. How many grams of silver did they obtain? (show all work) 2. Calculate the concentration in ug/ mL of the four standards you will prepare in week 2 of the instrumental procedure. (show all work) 3. dissolved sample to 250.0 mL using a volumetric flask. The student then dilutes 2.0 mL of the sample to 100.0 mL using volumetric glassware. What is the concentration in micrograms/mL of solder in the final sample? ( show all work) 4. A student dissolves 0.2525 g of solder using nitric acid, and quantitatively dilutes the Revised Fall 2015 JABExplanation / Answer
Q1
constant weight --> the weight which will NOT change or decrease after being in the oven.
We require this to be constant, in order to ensure there is no humidity present
that is, the salt is anhydrous and not hydrated
Q2
MW of Ag= 107.8682
Mw of Agcl = 143.32
% AG = 107.8682/143.32 * 100 = 75.263 %
therefore, if 0.7295 g are totally obtained
% Ag = 75.263 /100 * 0.7295 = 0.549 g is Ag
Q3
ug /L = microgram/L
Q4
m = 0.2525
V = 250 mL
C = mass/V = 0.2525/250 = 0.00101 g/mL
now,
2 mL are used..
C1V1 = C2V2
C2 = C1*V1/V2 = 0.00101*2/100
C = 0.0000202 g/mL
C = 0.0000202*10^6 ug/mL
C = 20.2 ug/mL
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