Analytical Chemistry Problems

Please answer the attached - show work so I can apply to similar questions. See attached file for full problem description.

Analytical CHM

Calculate the result and the standard deviation of the result of the following computation. See attached file for full problem description.

The purity of a 0.287 -g samole of Zn(OH)2 is determined by titrating with a standard solution, requiring 37.8 mL. The HCL solution was standardized by precipitating AgCl in a 25.0-mL aliquot and weighing (0.462 g AgCl obtained). What is the purity of the Zn(OH)2 ?

The purity of a 0.287 -g samole of Zn(OH)2 is determined by titrating with a standard solution, requiring 37.8 mL. The HCL solution was standardized by precipitating AgCl in a 25.0-mL aliquot and weighing (0.462 g AgCl obtained). What is the purity of the Zn(OH)2 ?

Average sea water contains 1.27 x 10^3 ppm of Mg ^2+ and 400 ppm of Ca ^2+. calculate the molar concentration of each of these ions if the density of the sea water is 1.02 g/mL.

Average sea water contains 1.27 x 10^3 ppm of Mg ^2+ and 400 ppm of Ca ^2+. calculate the molar concentration of each of these ions if the density of the sea water is 1.02 g/mL.

A 0.500-g sample is analyzed spectrophotometrically for manganese by dissolving it in acid and transferring to a 250-mL flask and diluting to volume. Three aliquosts are analyzed by transferring 50-mL portions with a pipet to 500-mL Erirnmeyer flasks and reacting with an oxidizing agent, potasium peroxydisulfate, to convert the manganese to permanaganate. After reaction, they are quantitatively trnasferred to 250-mL volumetric flasks, diluted to volume, and measured spectrophotometrically. By comparison to standards, the average concentration in the final solution is determined to be 1.25 x 10^-5 M. What is the percent of manganese in the sample?

A 0.500-g sample is analyzed spectrophotometrically for manganese by dissolving it in acid and transferring to a 250-mL flask and diluting to volume. Three aliquosts are analyzed by transferring 50-mL portions with a pipet to 500-mL Erirnmeyer flasks and reacting with an oxidizing agent, potasium peroxydisulfate, to convert the ...continues

Analytical chemistry

Calculation of pH, calculation of pOH, relationship between pH , pOh and pKw

pH, pOH, PKw

Calculating pH, pOH, pKw; Hydrolysis of salts of: weak acid and strong alkali or strong acid and weak alkali.

pH, pOH, PKw

Calculating pH, pOH, pKw; Hydrolysis of salts of: weak acid and strong alkali or strong acid and weak alkali.

pH, pOH, PKw

Calculating pH, POH, PKa, PKb.

pH, pOH, PKw

Calculating pH, POH, PKa, PKb.