Other Chemistry Answers

2. A solution containing 0.402 49 g of CoCl2 ∙ xH2O (a solid with an unknown number of waters of hydration) was exhaustively electrolyzed to deposit 0.09937 g of metallic cobalt on a platinum cathode by the reaction Co2+ + 2e-  Co(s). Calculate the number of moles of water per mole of cobalt in the reagent.

What is the [H3O+ ] of 1.0 M  HF mixed with 1.0 M NaF. Ka = 6.6 x 10-4

Ka for ethanoic acid is 1.7 × 10^–5 mol dm^–3 at 25 °C.

What is the pH of a 0.125 mol dm^–3 solution of ethanoic acid at this temperature?

What is the pH of an aqueous solution of 3.99×10^-2 M nitric acid? 

pH = 

2NOBr(g) 2NO(g) + Br₂(g) 

If 0.364 moles of NOBr(g), 0.448 moles of NO, and 0.543 moles of Br₂ are at equilibrium in a 19.1 L container at 464 K, the value of the equilibrium constant, K_c, is  .

An aqueous solution is made by dissolving 29.4 grams of nickel(II) nitrate in 403 grams of water.  

The molality of nickel(II) nitrate in the solution is m

An aqueous solution of sodium bromide, NaBr, contains 3.40 grams of sodium bromide and 17.4 grams of water.

The percentage by mass of sodium bromide in the solution is   %.

conjugate acid of PO3−4

conjugate acid of NH3

conjugate base of H2CO3

conjugate base of HSO-4

conjugate base of NH+4

What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=5.2×10−9 M?