Gravimetric analysis

. A 0.897g sample containing chloride ion is treated with excess lead (II) nitrate. The lead (II) chloride precipitated is filtered into a filter paper that weighed 0.923g. After washing and drying the precipitate+ filter paper weighed 2.686g. Calculate the following:

1) Write the total ionic and net ionic equation for the reaction producing the precipitate:

total ionic:

net ionic:

2) Why was excess lead (II) nitrate used in the above procedure?

3) moles of lead (II) chloride formed:________

4) Moles of chloride present in the sample__________ and Mass of chloride present in the sample _________

5) % of chloride in the sample: ___________

6) Is the mass of the sample same as the mass of precipitate?