ALLIED CHEM EXIT EXAM

A 0.5843 g sample of a plant food preparation was analyzed for its N content using Kjeldahl method, the liberated NH3 was collected in 50.00 mL 0.1062 M HCI. The excess acid required an 11.89 mL of 0.0925 M NaOH for back titration. Express the results if this analysis in terms %(NH4)2SO4.

A 0.917-g sample of canned tuna was analyzed by the modified Kjeldahl method. A volume of 20.59 mL of 0.1249 M HCI was required to titrate the liberated ammonia. Calculate the percentage of nitrogen in the sample.

A fluoride ion-selective electrode is used in two solutions. Both solutions have [F] of 5.00 x 10-3 M, but one has a pH of 2.00 and the other a pH of 7.00. You would expect that:

Branch of electrochemistry concerned with the relationship between the potential of an electrochemical cell and the concentration of the contents of the cell.

It is a half-cell having a known electrode potential that remains constant at constant temperature and is independent of the composition of the analyte solution

To find the concentration of manganese ions in a sample, the absorbance of different solutions containing known concentrations of manganese ions was also measured. The results are shown in the graph below. The absorbance reading for a 10 mL sample of manganese ions of unknown concentration is 0.18. Determine the amount (in mg) of manganese ions in the 10 mL sample.

A solution contains 0.100 M sodium nitrate (NaNO3) and 0.200 M MgCl2. Find the ionic strength of the solution.

In the formula for determining the ionic strength, what does Z stand for?

Which of the following equations represents a charge balance equation for a saturated solution of Ag₃AsO₄?

A 4.957 g sample of a hydrocarbon is burned in an excess of dioxygen, producing 9.284 g CO2 and water. What mass of hydrogen is contained in the original sample?

Analysis of a compound showed that it contained 76.0 % fluorine atoms and 24.0 % carbon atoms by mass. What is its empirical formula?

A 3.903 g sample of a hydrocarbon is burned in an excess of dioxygen, producing 7.31177 g CO2 and 4.488 g H2O. What is the empirical formula of the hydrocarbon?

Which substance would produce 2 mol of particles per mole of solute when dissolved in water?

Which of the following electrochemical methods requires the formation of an insoluble form of the analyte?

In the cell notation: Zn(s) I Zn+2 (aq) II Cu+2 (aq) I Cu (s), which species acts as the oxidizing agent?

The limiting current in a linear sweep voltammogram is related to ____

Predict the product for the following reaction.

Provide the product for the following reaction sequence.

What is the IUPAC name for the following compound?

Which one of the following pairs of compounds will yield the following product in presence of sulfuric acid?

Provide the reagents necessary to carry out the following conversion.

What is the IUPAC name for the following compound?3.