Problem 57
A sample of sodium carbonate is treated with \(50.0 \mathrm{~mL}\) of \(0.345 \mathrm{M} \mathrm{HCl}\). The excess hydrochloric acid is titrated with \(15.9 \mathrm{~mL}\) of \(0.155 \mathrm{M} \mathrm{NaOH}\). Calculate the mass of the sodium carbonate sample.
Problem 58
58\. The chloride in an aqueous sample of \(\mathrm{BaCl}_{2}\) is precipitated with \(50.0 \mathrm{~mL}\) of \(0.100 \mathrm{M} \mathrm{AgNO}_{3}\). The excess silver nitrate is titrated with \(17.0 \mathrm{~mL}\) of \(0.125 \mathrm{M} \mathrm{K}_{2} \mathrm{CrO}_{4} .\) Calculate the mass of the barium chloride in the sample. $$\mathrm{BaCl}_{2}(a q)+2 \mathrm{AgNO}_{3}(a q) \longrightarrow 2 \mathrm{AgCl}(s)+\mathrm{Ba}\left(\mathrm{NO}_{3}\right)_{2}(a q)$$ \(2 \mathrm{AgNO}_{3}(a q)+\mathrm{K}_{2} \mathrm{CrO}_{4}(a q) \longrightarrow \mathrm{Ag}_{2} \mathrm{CrO}_{4}(s)+2 \mathrm{KNO}_{3}(a q)\)
Problem 59
A computer application program can transfer information to a word processing document, a database, and a spreadsheet. Draw a concept map for the computer application.
Problem 60
The president of a college reports to a board of trustees and three vice- presidents report to the college president. The chief financial officer reports directly to the board of trustees. Draw a concept map for the college administration.
Problem 61
What are the main uses of nitric acid?
Problem 62
What are the main uses of ammonia?
Problem 63
What are the main uses of ammonia?
Problem 64
What is the value of a googolplex?
