Determine the copper content of a brass sample

Assignment Help Chemistry

Reference no: EM13707942

Problem- You are using the following procedure from your lab instructions to determine the copper content of a brass sample: "Approximately 35 mg of a dried brass sample (accurately measured) is put into a 250-mL Erlenmeyer flask. About 20 mL of H2O and 10 mL of concentrated HNO3 is added. This sample is digested, then quantitatively transferred to a 100-mL volumetric flask and diluted to the mark. The sample is still too concentrated, so a 1:20 dilution is accomplished by transferring 5.00 mL of this solution to another 100-mL volumetric flask and diluting to the mark." If you actually used a 31.7 mg sample of brass, and the resulting diluted solution was found to contain 13.68 mg/L of Cu, what is the %Cu in the sample?

Provide complete steps to solve the above question any help is appreciated

Reference no: EM13707942

Questions Cloud

Explain what is the purpose of nach3coo in the buffer : Problem- Consider the acetic acid buffer system with acetic acid, CH3COOH, and its salt sodium acetate, NaCH3COO, CH3COOH(aq) + H2O(l) ---- H3O+ (aq) + NaCH3COO (aq)

Predict which titration curve will have lowest initial ph : Problem- Two 20.0mL samples, one 0.100 MHCl and the other 0.100 MHF, were titrated with 0.200 MKOH. Answer each of the following questions regarding these two titrations.

Define final temperature in the calorimeter : If the same procedure is followed with a different metal that has a specific heat of 0.115 cal/g oC , what will be the final temperature in the calorimeter

Find the empirical formula of the compound : Problem- A 2.135 sample of gaseous chlorofluorocarbon occupies a volume of 315.5 mL at 739.2 mm Hg and 26.1 degrees C. Analysis of the compound shows it to be 14.05% C, 41.48% Cl, and 44.46% F by mass. Find the empirical formula and then the molec..

Determine the copper content of a brass sample : Problem- You are using the following procedure from your lab instructions to determine the copper content of a brass sample: "Approximately 35 mg of a dried brass sample (accurately measured) is put into a 250-mL Erlenmeyer flask.

Define the great pyramid in egypt has a carbon-14 : Problem- A wooden boat discovered just south of the Great Pyramid in Egypt has a carbon-14/carbon-12 ratio that is 71.5% of that found in living organisms

Define what is the cu concentration : This calibration was carried out in a 1.00 cm cell, and yielded an absorbance of 0.2850 AU. An unknown was then analyzed in this same spectrophotometer, but using a 2.50 cm cell. If the absorbance of the unknown was 0.2270 AU, what is the Cu conce..

Calculate the concentration of cu in the chloroform : Calculate the concentration of Cu in the chloroform phase if 31.0 mL of a 0.23 M aqueous Cu solution buffered to pH 4 is equilibrated with 19.0 mL of chloroform.

Determine the amounts of oxidizing and reducing agents : Problem- Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equati..

User Account

All Pages