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A common way of removing Cr3+ from solution is by precipitation of Cr(OH)3(s). An environmental engineer tells you that adjusting the pH to 8.5 will decrease total soluble Cr(III) to below 1 mg/L (1.92 x 10-5 M). Is this true? In other words, is the solubility of Cr(III) in the presence of Cr(OH)3(s) at a pH of 8.5 ? 1 mg/L. The pKsp of Cr(OH)3(s) is 30.22. Cr3+ forms 4 complexes with hydroxide: log K1 = 10.00, log K2 = 8.38, log K3 = 6.87, log K4 = 2.98. Assume no other solids or ligands are present.
The slope of the Gran Plot for the titration of KHP with NaOH was found to be -1E-05. Use this to determine ka2. Other values that may be of importance: concentration was measured
A researcher plans to compare two treatment conditions by measuring one sample in treatment 1 and a second sample in treatment 2. The researcher will then compare the scores for the two treatments.
Arsine (AsH3) has a vapor pressure is 35 Torr at -111.95?C and 253 Torr at -83.6 ?C. What is the normal boiling point of arsine.
Given a solution containing 0.01M of lead chloride and 0.01M of lead chromate, calculate the concentration of Pb2+. Using the Ksp(PbCl2)=1.7x10^-5 and Ksp(PbCrO4)=1.77x10^-14. What is the solid remaining?
When calcium carbonate is added to hydrochloric acid, calcium chloride, carbon dioxide, and water are produced. CaCO3 + 2HCl image from custom entry tool CaCl2 + H2O + CO2
Calculate the length in km of a row containing 1 mole of hydrogen atoms laid side to side if diameter of a hydrogen atom =.212 nm?
12.0 moles of gas are in a 5.00 L tank at 23.9 C. Calculate the difference in pressure between methane and an ideal gas under these conditions.
Describe the preparation of 12 mL of a 0.050 M solution of each of the halogens, using the reactions in the preceding question. Available to you are solid Ca(OCl)2
If 10.7ml of 0.105 M NaOH ir required to reach the first equivalence point of a solution of citric acid (H3C6H5O7), how many milliliters of NaOH are required
Determine At what temperature does C 6 H 6 boil when the external pressure = 470 torr?
As early as 1938, the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following (unbalanced) reaction: NaOH + CO2 → Na2CO3 + H2O.
A 125.0g sample of copper is initially at 25.0oC. It absorbs 12.50 kJ heat from its surroundings. What is the final temperature to the nearest tenth degree? Specific heat copper = 0.3874 J/goC.
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