Calculate the amounts of na hpo and nah. po (in grams) needed to prepare 200 ml. of a buffet with ph - 8.25 so that the sum of concentrations of hpo and h, po, ions is 0.5 m. pk. - 2.12. pk = 7.21, pk,= 12.38

Aspirin has a density of 1.40 g/cm3 what is the volume in cubic centimeters of a tablet weighing 320 mg ?

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?