Module #40 You have been given a solution that might contain any of the following cations: Cd2+, Ag*, Cr³+, and Ca²+ Addition of excess HCI causes a precipitate to form. This precipitate is filtered off. An excess of H₂SO4 is added to the remaining solution, causing a second precipitate to form. The second precipitate is filtered off and NaOH is added to the remaining solution until it is strongly alkaline. No precipitate forms. Using the solubility rules found in your lab manual and/or text book, identify whether or not each cation was initially present in the original solution. Cr³+ (aq) choose.. 0 Cd2(aq) Choose... Ag (aq) Present in original solution. Not present in original solution Ca² (aq) Not enough information given in question

where did 0.693 come from

A volumetric calcium analysis on triplicate samples of the blood serum of a patient believed to be suffering from a hyperparathyroid condition produced the following data: mmol Ca/L = 3.55, 3.65, 3.14. What is the 95% confidence interval for the mean of the data, assuming(a) No prior information about the precision of the analysis?(b) s → σ = 0.056 mmol Ca/L?

Please show your solutions. The correct answer is provided. Thank you. CORRECT ANSWER: 1.41

12 - 25.0 mL of a 0.1655 M NH4CI solution is added to 55.5 mL of 0.2450 M FeC13. What is the concentration of chloride ion in the final solution?

The concentration of H* (or H3O*) from part A should be 1.02×10-2 mol L-1. What is the pH of the solution?

8. For this question two statements are given- one labeled Assertion (A) and the other labelled Reason (R). Select the correct answer to this question from the codes (a), (b), (c) and (d) as given below. (a) Both A and R are true, and R is correct explanation of the assertion (b) Both A and R are true, but R is not the correct explanation of the assertion (c) A is true but R is false (d) 4 is false, but R is true. Assertion: The particles of a suspension can be seen by naked eye. Reason: When a suspension is left undisturbed, it becomes unstable

What two ionic compounds are dissolved in the filtrate after the suction filtration step What two compounds are being removed when you heat the solid CaCO; in the oven?

A sample contained a mixture of NaHCO3, NACO, and inert material. If A represents the millilitres (mL) of standard acid to reach the phenolphthalein end point and B the volume of acid needed to go from this point to the methyl orange end point, which of the following relationships will be obserrved? O A B>A, A>0 O B. A>B; B>0 OC A=0, B>A O D. None of the given answers OE. A-B, B>0

Translate to a system of equations and solve.   A scientist needs 150 milliliters of a 20% acid solution for an experiment. The lab has available a 25% and a 10% solution. How many milliliters of the 25% solution and how many milliliters of the 10% solution should the scientist mix to make the 20% solution?   25% solution  10% solution