Arsenic acid, H3AsO4(aq), is a weak polyprotic acid that is highly toxic. It is
used as a wood preservative, a biocide and a reagent in the synthesis of
some dyes. Arsenic acid reacts with water, as represented by the following
Bronsted-Lowry equations.

A.
H3AsO4(aq) + H2O(1) = H2AsO4(aq) + H3O+(aq)
B.
H2AsO4(aq) + H2O(l) = HASO(aq) + H3O+ (aq)
C.
HASO(aq)+H2O(l) = AsO4-(aq)+H3O+(aq)

Match the following K, values with the above equilibriums.
1. 5.6 x 10-3
2. 4.0 x 10-12
3. 1.7 x 10-7

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.

What is the percent by mass of oxygen in fe2o3

Acetylene gas c2h2 undergoes combustion to produce carbon dioxide and water vapor how many grams of water are produced by the same amount of c2h2?