Question

080 A 100 grams sample of Limestone is
dissolved in acid and Calcium is
precipitated as Calcium Oxalate. The
precipitate is filtered, washed with water
and dissolved in dilute H, SO. The
solution required 50 ml of 0.25N KMnO,
solution for titration. Calculate the
percentage of Call in Limestone​

Answer 1

Answer:

Explanation:

equivalent of  kmno4 = 12.5

equivalent of caco3 = 12.5

equivalent of ca+2 = 12.5

moles*f*1000 = 12.5

moles = 12.5/2000

0.00625 = moles

w/40= 0.00625

w=0.25

equivalent of limestone initially = 1*2*1000

equivalent of limestone initially = 2000

equivalent of ca+2 initially = 2000

moles*f*1000 = 2000

moles=1

w=40

percentage of ca+2 = 0.25/40*100

=25/40

=0.625