Questions from General Chemistry

Q: Approximately 15% of the particles in a shipment of silver-

Approximately 15% of the particles in a shipment of silver-bearing ore are judged to be argentite, Ag2S (d = 7.3 g cm-3, 87% Ag); the remainder are siliceous (d = 2.6 g cm-3) and contain essentially n...

Q: The addition of dimethylglyoxime, H2C4H6O2N2, to a solution containing nickel

The addition of dimethylglyoxime, H2C4H6O2N2, to a solution containing nickel(II) ion gives rise to a precipitate: Nickel dimethylglyoxime is a bulky precipitate that is inconvenient to manipulate in...

Q: a. Compare the masses of potassium hydrogen phthalate (204.

a. Compare the masses of potassium hydrogen phthalate (204.22 g/mol), potassium hydrogen iodate (389.91 g/mol), and benzoic acid (122.12 g/mol) needed for a 50.00-mL standardization of 0.0600 M NaOH....

Q: A 50.00-mL sample of a white dinner wine

A 50.00-mL sample of a white dinner wine required 24.57 mL of 0.03291 M NaOH to achieve a phenolphthalein end point. Express the acidity of the wine in grams of tartaric acid H2C4H4O6 ;15009g/mol...

Q: A 25.0-mL aliquot of vinegar was diluted to

A 25.0-mL aliquot of vinegar was diluted to 250 mL in a volumetric flask. Titration of 50.0mL aliquots of the diluted solution required an average of 25.23 mL of 0.09041 M NaOH. Express the acidity of...

Q: Titration of a 0.7513-g sample of impure Na2B4O7

Titration of a 0.7513-g sample of impure Na2B4O7 required 30.79 mL of 0.1129 M HCl (see Problem 14-16f for reaction). Express the results of this analysis in terms of percent a. Na2B4O7 b. Na2B4O7...

Q: A 0.7041-g sample of impure mercury(II

A 0.7041-g sample of impure mercury(II) oxide was dissolved in an unmeasured excess of potassium iodide. Reaction: HgOs4IH2OHgI242OH Calculate the percentage of HgO in the sample if tit...

Q: The formaldehyde (HCHO) content of a pesticide preparation was determined

The formaldehyde (HCHO) content of a pesticide preparation was determined by weighing 0.2985 g of the liquid sample into a flask containing 50.0 mL of 0.0959 M NaOH and 50 mL of 3% H2O2Upon heating,...

Q: The benzoic acid extracted from 86.7 g of catsup required

The benzoic acid extracted from 86.7 g of catsup required a 15.61-mL titration with 0.0654 M NaOH. Express the results of this analysis in terms of percent sodium benzoate (144.10 g/mol).

Q: The active ingredient in Antabuse, a drug used for the treatment

The active ingredient in Antabuse, a drug used for the treatment of chronic alcoholism, is tetraethylthiuram disulfide, (296.54 g/mol). The sulfur in a 0.4169-g sample of an Antabuse preparation was o...