1B.4 Precipitation reactions

Question 1

what are the 3 type of percipitation reaction

Answer 1

1. when carbon dioxide reacts with lime water (calcium hydroxide) to form a white participate of calcium carbonate
2. when sulfate ions react with baruim ions to form a white participate of baruim sulfate
3. when halide ions react with silver ions (silver nitate) forms a participate of silver halide

Question 2

what is the equation that forms calcium carbonate precipitate

Answer 2

Ca(OH)2 (aq) + CO2(g) —–> CaCO3(s) + H2O (l)

Question 3

what is the equation that forms barium sulfate precipitate

Answer 3

Na2SO4 (aq)+ BaCl2 (aq) ——> BaSO4 (s) + 2NaCl (aq)

SO4 + Ba ——> BaSO4

Question 4

what is the equation that forms Silver chloride precipitate

Answer 4

AgNO3(aq) + NaCl2(aq) —-> AgCl2(s) + NaNO3(aq)

Ag + Cl2 —-> AgCl2

Question 5

what is a precipitate reaction

Answer 5

a reaction in which an insoluble solid is formed when two solutions are mixed

Question 6

how can we carry a reaction between lead nitrate and potassium iodide

Answer 6

step 1: but the same volume of potassium iodide in a series of tubes
step 2: but different amounts of lead nitrate in each tube
step 3: put the tubes in a centrifuge and spin the tubes for the same length of time
step 4: measure the depth of the participate
keep the concentration of both a 1
the depth of each participate indicates the mass of the participate formed

Question 7

how can we find the ratio of lead nitrate and potassium iodide

Answer 7

by putting their moles in a ratio ( use C=n/v to find moles)

Question 8

how do we know when the reaction of lead nitrate and potassium iodide is complete

Answer 8

when the depth stops changing