1.

What is the mass of precipitate formed when 50 ml of 8.5% solution of AgNO_(3) is mixed with 100 ml of 1.865% potassium chloride solution?

Answer»

3.59g
77g
14g
28g

SOLUTION :`AgNO_(3) + KCl to KNO_(3) + AgCl`
50 mL of 8.5% solution CONTAINS 4.25 g of `AgNO_(3)`
No. of moles of `AgNO_3` present in 50 mL of 8.5% `AgNO_3` solution
= Mass / Molar mass = 4.25 / 170
= 0.025 moles
Similarly, No of moles of KCI present in 100 mL of 1.865% KCI solution
= 1.865/74.5 = 0.025 moles
So total amount of AgCI formed is 0.025 moles (based on the stoichiometry)
Amount of AgCI present in 0.025 moles of AgCI
= no. of moles `xx` molar mass = `0.025 xx 143.5 = 3.59 g`


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