Investigating Stoichiometry - The table shows the mass of reactants potassium iodide and lead(II) nitrate, and the mass of the precipitate from the reaction

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SSIS DP IB Program

Science Investigation Report

Investigating Stoichiometry

Name: Kimberly Hoong Yearn Yi

Class: H1Ruby

Results

Quantitative Data:

The table shows the mass of reactants potassium iodide and lead(II) nitrate, and the mass of the precipitate from the reaction between KI(aq) and Pb(NO3)2(aq).

Mass of precipitate from reaction between KI(aq) and Pb(NO3)2(aq)

Mass of potassium iodide (±0.001g)

1.701

Mass of lead(II) nitrate (±0.001g)

1.280

Mass of filter paper (±0.001g)

0.798

Mass of precipitate + filter paper (±0.001g)

2.525

Mass of precipitate (±0.001g)

1.727

Qualitative Data:

1) After pouring the KI(aq) and Pb(NO3)2(aq) solution together into the beaker, a glass rod was used to stir the solution so as to make sure it was mixed properly. However, after stirring, when the glass rod was taken out, there were small amounts of precipitate (PbI2(s)) stuck onto the glass rod, and could not be removed.

2) While pouring the remaining mixture into the filter paper, not all the mixture was poured into the filter funnel and paper. Some of the mixture was stuck in the beaker even after trying to wash