Questions from General Chemistry

Q: Titration of 50.00 mL of 0.04715 M Na2C2O4

Titration of 50.00 mL of 0.04715 M Na2C2O4 required 39.25 mL of a potassium permanganate solution. 2MnO4 2 + 5H2C2O4 + 6H1 → 2Mn21 + 10CO21g2 + 8H2O Calculate the molar concentration of the KMnO4 solu...

Q: Titration of the I2 produced from 0.1142 g of primary

Titration of the I2 produced from 0.1142 g of primary-standard KIO3 required 27.95 mL of sodium thiosulfate. IO3 2 + 5I2 + 6H1 → 3I2 + 3H2O I2 + 2S2O3 22 → 2I2 + S4O6 22 Calculate the concentration of...

Q: What CrO42- concentration is required to a. Initiate precipitation

What CrO42- concentration is required to a. Initiate precipitation of Ag2CrO4 from a solution that is 5.24 × 10-3 M in Ag+? b. Lower the concentration of Ag+ in a solution to 7.82 × 10-7 M?

Q: A 4.912-g sample of a petroleum product was

A 4.912-g sample of a petroleum product was burned in a tube furnace, and the SO2 produced was collected in 3% H2O2. Reaction: SO21g2 + H2O2 → H2SO4 A 25.00-mL portion of 0.00873 M NaOH was introduced...

Q: A 100.0-mL sample of spring water was treated

A 100.0-mL sample of spring water was treated to convert any iron present to Fe21. Addition of 25.00 mL of 0.002517 M K2Cr2O7 resulted in the reaction 6Fe21 + Cr2O7 22 + 14H1 → 6Fe31 + 2Cr31 + 7H2O Th...

Q: Three different analytical methods are compared for determining Ca in a biological

Three different analytical methods are compared for determining Ca in a biological sample. The laboratory is interested in knowing whether the methods differ. The results shown next represent Ca resul...

Q: The arsenic in a 1.203-g sample of a

The arsenic in a 1.203-g sample of a pesticide was converted to H3AsO4 by suitable treatment. The acid was then neutralized, and 40.00 mL of 0.05871 M AgNO3 was added to precipitate the arsenic quanti...

Q: The thiourea in a 1.455-g sample of organic

The thiourea in a 1.455-g sample of organic material was extracted into a dilute H2SO4 solution and titrated with 37.31 mL of 0.009372 M Hg21 via the reaction 41NH222CS + Hg21 → 31NH222CS44Hg21 Find t...

Q: A solution of Ba1OH22 was standardized against 0.1215 g of

A solution of Ba1OH22 was standardized against 0.1215 g of primary-standard-grade benzoic acid, C6H5COOH 1122.12 g>mol2. An end point was observed after addition of 43.25 mL of base. a. Calculate the...

Q: What mass of AgI can be produced from a 0.512

What mass of AgI can be produced from a 0.512-g sample that assays 20.1% AlI3?