1. 10.00 mL sample of concentrated HCl was diluted to mark in 250 mL volumetric flask. To titrate 25.00 mL sample of diluted solution 43.56 mL of 0.1023 M NaOH was needed. What was the original concentration of hydrochloric acid?
1. 10.00 mL sample of concentrated HCl was diluted to mark in 250 mL volumetric flask. To titrate 25.00 mL sample of diluted solution 43.56 mL of 0.1023 M NaOH was needed. What was the original concentration of hydrochloric acid?
2. 1.456 g sample of unknown alloy was dissolved in acid and diluted to 100 mL. What was the percentage of iron (MW = 55.85g/mol) in the sample, if titration of 20.00 mL aliquot of the diluted solution requires on average 33.45 mL of 0.01005 M solution of potassium permanganate?
Reaction: 5Fe2+ + MnO4- + 8H+ → 5Fe3+ + Mn2+ + 4H2O
3. 1.354 g sample of sodium nitrate contaminated with NaCl was dissolved in small amount of water and filled to the mark in the 100 mL volumetric flask. To titrate chlorides in 10.00 mL aliquot sample 35.70 mL of 0.01021 M AgNO3 was used. What is the percent purity of the sample? (Hint: recall solubility rules to identify the precipitate)
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