Page 77 - Statistics presented by Dr. Sara Ismail Aborass

9/8/2023

• Example:
• How many grams of chloride (F. Wt. = 35.5) are

contained in a ppt of AgCl (F. Wt. = 143.3) that
weighs 0.204 gm.

151

• Cl- + Ag+ AgCl
• analyte ppt
Fwt=35.5
Wt=? Fwt=143.3
Wt= 0.204gm

GF = a X F.Wt of substance sought (analyte)
b F.Wt of substance weighed (ppt)

GF= (1/1) x (35.5/143.3) = 0.248

Wt of analyte= GF x Wt of ppt

= 0.248 x 0.204 = 0.05 gm

Cl-

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