Chemistry, 28.08.2020 04:01 zanestone12
(d) why does the h3o concentration have more influence on the precipitation of the salt of a weak acid, such as cac2o4(s), than on the precipitation of the salt of a strong acid, such as agcl(s) or caso4(s)?
Answers: 2
Chemistry, 22.06.2019 05:30
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.
Answers: 1
Chemistry, 22.06.2019 20:30
How many grams of phosphorus are contained in 5.09 moles of phosphorus?
Answers: 1
Chemistry, 22.06.2019 21:00
Write a balanced equation showing the formation of copper (ii) nitrite from its elements
Answers: 1
(d) why does the h3o concentration have more influence on the precipitation of the salt of a weak ac...
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