ll help 2- 5.00 grams of potassium sodium hydrogen carbonate were separately hyd

Question

ll help 2- 5.00 grams of potassium sodium hydrogen carbonate were separately hydrogen carbonate and 5.00 grams of product formed in each decomposed by heating in a crucible. Calculate the mass crucible. mass ratio of the salt formed to the salt decomposed in each reaction? 3- 5.00 grams of potassium carbonate and 5.00 grams sodium carbonate were treated separately with excess 6M HCI and then was heated in a crucible. Calculate the mass product in each crucible. What is mass ratio of the salt formed to the salt decomposed in each reaction Post lab Questions potassium bicarbonate were added into a 1- 2.0 grams of sodium bicarbonate and 2.0 grams of will crucible and heated with the lid partly open to constant mass, how many grams of products remain? 2- In the experiment, what would happen to the mass data if not enough hydrochloric acid is added to dissolve the solid?

Explanation / Answer

Q2.

m = 5 g of KHCO3

m = 5 g of NaHCO3

reactions:

2KHCO3 + heat = H2O + CO2 + K2CO3

2NaHCO3 + heat = H2O + CO2 + Na2CO3

now...

a) for each cruicible:

mol of KHCO3 = mass/MW = 5/100.115 = 0.04994 mol

mol of NaHCO3 = mass/MW = 5/84.007 = 0.05951 mol

relate to sotichiometry, 1 mol of KHCO3 = 1/2 mol of K2CO3

relate to sotichiometry, 1 mol of NaHCO3 = 1/2 mol of Na2CO3

mol of K2CO3 = 1/2*0.04994 = 0.02497

mol of Na2CO3= 1/2*0.05951 = 0.029755

find masses

mass of K2CO3 =mol*MW = 138.205 *0.02497   = 3.4509

mass of Na2CO3= 0.029755 *105.9888 = 3.153

find mass ratio of falt formed / salt decomopsed of each reaction

Potassium Salt: 3.45/5 = 0.69

Sodium salt 3.153/5 = 0.6306

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