DATE SECTION POSTLABORATORY ASSIGNMENT 1. A standard nitric acid solution is pre

Question

DATE SECTION POSTLABORATORY ASSIGNMENT 1. A standard nitric acid solution is prepared using 0.425 of carbonate. Na2CO3. Find the molarity of the acid if 33.25 mL are required to reach a permanent endpoint. 2 HNO3 (aq) Na2CO3 (s) 2 NaNO3 (aq) H20 CO2 (g) 2. A 10.0 mL sample of household ammonia solution required 27.50 mL of 0.241 M HNO for neutralization. Calculate (a) the molar concentration of the ammonia and (b) the mass/mass percent concentration of ammonia (17.04 g/mol), given a solution density of 0985 g/ml HNO3 (aq) NH3 (aq) NH4NO3 (aq) (a) (b) 3. A 100 ml sample of calcium hydroxide solution required 26.85 ml of 0.225 M hydrochloric acid for neutralization. Calculate (a) the molar concentration of the base. 2 HCl(aq) Ca (OH)2 (aq) CaCl2(aq) 2 H200) Analysis of vinegar 239 Copyright c 2013 Pearson Education

Explanation / Answer

1.Number of moles of Na2CO3,n= mass/molar mass

n=0.425 g/106(g/mol)

=0.004 mol

From the balanced reaction

1 mol of Na2CO3 reacts with 2 moles of HNO3

0.004 moles of Na2CO3 reacts with 2*0.004=0.008 moles of HNO3

Molarity of HNO3,M=number of moles/ volume in L

=0.008mol/(33.25ml*10^-3L/ml)

=1.206 M

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