Other Chemistry Answers

Construct a table comparing the similarities and differences of Double indicator, EDTA, and Mohr titration in terms of the:

a.) Reactants

b.) Products

c.) Indicator used

d.) End point

e.) Application / Purpose

A necklace contains 0.250 mol of silver. How many atoms of silver are in the necklace

a stock solution of 4.0mol/L copper 2 carbonate is available. students need to make a 1L quantity of 0.25mol/L solution. calculate the volume of stock solution needed. then calculate what you need to make 1Lof 2.5×10^6mol/L solution. show the calculations and describe the steps necessary to make the new solutions.

Osmium is completely colored in because

a. It is the element with the highest density on the Periodic Table

b. It is in the center of the Periodic Table.

c. It is the standard for the value of metals on the Periodic Table.

d. It exists for only a short while and it cannot be measured for density.

If 4.00 moles of gas and his pressure of 5.40 atm has a volume of 122 L what is the temperature

If 500g of marble are decomposed completely and knowing that it contains 90% calcium carbonate, calculate the mass of calcium oxide and the volume of carbon dioxide ( at S.T.P.) produced.

The Cd & Pb ions in a 50.00-mL req’d 40.19 mL of 0.004870 M

EDTA for titration. A 75.00-mL portion of the same sample was made to be

basic & treated with x’ss KCN, masking the Cd as Cd(CN)4

2-. This soln req’d 31.45 mL of the EDTA for titration. Calc. conc. of Cd2+

(112.41 g/mol) & Pb2+ (207.2 g/mol) in the sample in ppm.

An antacid tablet weighing 15.468 g was dissolved in acid

& diluted to 500.0 mL. Then, a 25.00 mL aliquot of the soln was

made basic to ppt the aluminum as Al(OH)3.

The remaining magnesium req’d 16.50 mL of 1.042 x 10^-2 M

EDTA for titration. A second 25.00 mL aliquot was

withdrawn from the 500-mL flask & treated with 50.00 mL

of the EDTA. This soln was made basic & the x’ss EDTA back

titrated with 11.75 mL 5.597 x 10^-3 M MgCl2. Calc. % of

both Mg (24.30 g/mol) & Al (26.98 g/mol) in the sample.

A 10.00-mL aliquot of a commercial algaecide contg. An

organomercury cpd. was treated with conc. HNO3 and

evaporated just to dryness. The residue of mercuric nitrate

was dissolved in dilute HNO3 & diluted to 250.0 mL with

water. A 52.00-mL aliquot of this soln was treated with

20.00 mL of 0.04966 M EDTA & mixed thoroughly for 20

min. After adjusting the pH 10, the x’ss EDTA req’d 18.04

mL of 0.04711 M MgCl2 for titration to the EBT end pt.

Calc. conc. of mercury in the original sample in units of mg

Hg / mL (200.59 g/mol).

If 500g of marble are decomposed completely and knowing that it contains 90% calcium carbonate, calculate the mass of calcium oxide and the volume of carbon dioxide ( at S.T.P.) produced.