Question
part B snd C
emic Analysis DATA Trial 4 Massaf Basso, and paper, Mass of paper. 676 Muse of Baso, precipitate, issoles of Hasoo that reaowed volume of neal solution reactod,mL sml. -1 3m H:soul final solution M H sol stock solution, M Average lHasoal, initial soln, M valumenrku Determination of Aeld concentration Molarity of NaoEHoaqys 0 loom Trial 2 Trial 3 Trial 4 Initial NaOH buret reading, ml. 46. Final NaoH buret reading, ml. ll. volume of NaoHag used, mL 3s, L 30.7 72.s us: ou 0.01 Millimales of Hrsov titrated volume of final solution titrated, mL lun lon lHasol final solution, M soul stock solution, M. IH,soa, initial solution, M Average IH soil, initial soln, M "Calculated by taking the successive dilutions into account. ple Calculations
Explanation / Answer
Gravimetric and volumetric analysis
B. Gravimetric analysis of sulfate ion
BaSO4 ppt (g) : 0.4698 g
BaSO4 (mmol) : 0.4698/233.38 = 2 mmol
H2SO4 (mmol) : 2 mmol
Volume reacted : 5 ml
H2SO4 (M) : 2 mmol/5 ml = 0.4 M
C. Volumetric determination of acid concentration
2NaOH + H2SO4 --> Na2SO4 + 2H2O
NaOH (M) : 0.1 M
NaOH (ml) used : 35.1
NaOH (mmol) : 0.1 M x 35.1 ml = 3.51 mmol
H2SO4 (mmol) : 3.51/2 = 1.755
Initial (ml) reacted : 10
H2SO4 (M) : 1.755 mmol/10 ml = 0.1755 M