Menbers Empirical Formula of Zinc Chloride Data: Empirical Formula of Zinc Chlor

Question

Menbers Empirical Formula of Zinc Chloride Data: Empirical Formula of Zinc Chloride inc Chloride Samples -, ss5_9- t.gSS mass of watch glass, g mass of watch glass plus zinc chloride, initial mass of watch glass plus zinc chloride, final mass change on watch glass observations of zine chloride on watch glass at the end: mass of watch glass plus zine chloride,final +S.06 0. 022 e . e Zinc chlor de wo mass of zinc chloride in 50-mL beaker, g EDTA Titration oF Zinc Chloride d 35,50 Trial 1 Trial 2 somLgm;towy91.) . Initial buret volume zinc chloride Final buret volume . Volume zinc chloride titrated . concentration of EDTA, mol/L . Initial buret volume EDTA 20m 20 ML Dak 0.022S Final buret volume EDTA 20mLo . Vol EDTA titrant used, mL 127

Explanation / Answer

EDTA titration of Zinc chloride

Trial 1

a) mass of Zinc chloride titrated=32.601 g

b)#moles EDTA used in titration= =conc*volume=0.0225 mol/L*0.021 L=0.0004725 moles

c)# moles of zinc titrated= concentration*volume=4.78 mol/L*20 ml=4.78 mol/L*0.02L=0.0956 moles

[moles=mass/molar mass=32.601g/136.31g/mol=0.239 moles

conc=moles/volume=0.239 moles/50 ml=0.239/0.050 L=4.78 mol/L]

d)mass of zinc in titrated mass=moles*molar mass=0.0956 moles*65.38 g/mol=6.25 g

e)mass of Cl in titrated mass= mass of zinc chloride in titrated mass-mass of zn in titrated mass

=moles*molar mass(0.0956 moles*136.31 g/mol=13.03 g)-6.25g=6.780g

f)# cl in titrated sample=mass of cl in the sample/molar mass=6.780 g/35.5 g/mol=0.191 moles
g)molar ratio of Zn:Cl=0.0956:0.191=1:2

h)empirical formula of zinc chloride=ZnCl2

trial 2

same as trial 1

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