Prelab Questions : (PL1) Sketch the set up for titration for part 1. Indicate wh
ID: 881135 • Letter: P
Question
Prelab Questions : (PL1) Sketch the set up for titration for part 1. Indicate what compound is where. (PL2) Define half point, equivalent point, and end point and a titration. (PL3) In port 2, if you say the purity of sample is 57%, what does that mean? (Do not use the word % in your answer. (PL4) What is the concentration of nitric acid if 35.6mL of 100M calcium hydroxide was needed to completely neutralize 20.00mL of nitric acid? (PL5) What is the concentration of sulfuric acid if 35.6mL of 100M calcium hydroxide was needed to completely neutralize 20.00mL of sulfuric acid? (PL6) Compare the answers to (PL4) and (PL5). Discuss.Explanation / Answer
PL1 ) in complete question
PL2 ) half -equivalence point : the point at which the moles of acid is equal to the moles of conjugate base.
equivalence point :The equivalence point, of a chemical reaction is the point at which chemically equivalent quantities of acid and base have been mixed
end point : at end point one component completely reacted. from indicator we can know end point
PL3 ) purity of sample 57% percent means. out of 100 parts only 57 parts of sample is pure , remaining part is impurities .
PL4 ) Ca(OH)2 + 2HNO3 ------------------------> Ca(NO3)2 + 2H2O
1 for ----------------> Ca(OH)2 , 2 for-------------> HNO3
M1V1/n1 = M2V2/n2
1 x 35.6 / 1 = M2 x 20 / 2
M2 = 3.56 M
HNO3 concentration = 3.56 M
PL5 )
Ca(OH)2 + H2SO4 ------------------------> CaSO4 + 2 H2O
1 for ----------------> Ca(OH)2 , 2 for-------------> H2SO4
M1V1/n1 = M2V2/n2
1 x 35.6 / 1 = M2 x 20 / 1
M2 = 1.78 M
H2SO4 concentration = 1.78 M
PL6 ) H2SO4 concentration = 1.78 M
HNO3 concentration = 3.56 M
HNO3 concentration = 2 x H2SO4 concentration
because H2SO4 has 2 protons (H+ ions)