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- Practice Exercise 1How many milligrams of sodium sulfide are needed to completelyreact with 25.00 mL of a 0.0100 M aqueous solution ofcadmium nitrate, to form a precipitate of CdS(s)?(a) 13.8 mg (b) 19.5 mg (c) 23.5 mg (d) 32.1 mg (e) 39.0 mgHow many moles of sodium chloride should be put in a 50.0-mL volumetric flask to give a 0.15 M NaCl solution when the flask is filled to the mark with water? How many grams of NaCl is this?A sample of sodium chloride, NaCl, weighing 0. 0678 g is placed in a 25.0-mL volumetric flask. Enough water is added to dissolve the NaCl, and then the flask is filled to the mark with water and carefully shaken to mix the contents. What is the molarity of the resulting solution?
- ercise 15.6 Formalin is an aqueous solution of formaldehyde, HCHO, used as a preservative for biologic specimens. How many grams of formaldehyde must be used to prepare 2.5 L of 12.3 M formalin?Which ion has the larger hydration energy, Na+ or K+ ?Exercise 15.8 When aqueous solutions of Na2SO3 and Pb(NO3)2 are mixed, PbSO4 precipitates. Calculate the mass of PbSO4 formed when 1.25 L of 0.0500 M Pb(NO3)2 and 2.00 L of 0.0250 M NaSO4 are mixed.
- An experiment calls for 35.0 g of hydrochloric acid that is 20.2% HCl by mass. How many grams of HCl is this? How many grams of water?Practice Exercise 1Which of these substances, when dissolved in water, is a strongelectrolyte? (a) ammonia (b) hydrofluoric acid (c) folic acid(d) sodium nitrate (e) sucroseConsider three flasks, each containing 0.10 mol of acid. You need to learn something about the acids in each of the flasks, so you perform titration using a NaOH solution. Here are the results of the experiment: Flask A 10 mL of NaOH required for neutralization Flask B 20 mL of NaOH required for neutralization Flask C 30 mL of NaOH required for neutralization a What have you learned about each of these acids from performing the experiment? b Could you use the results of this experiment to determine the concentration of the NaOH? If not, what assumption about the molecular formulas of the acids would allow you to make the concentration determination?
- In the laboratory you dissolve 20.9 g of calcium chloride in a volumetric flask and add water to a total volume of 500 mL.What is the molarity of the solution? M.What is the concentration of the calcium cation? M.What is the concentration of the chloride anion? M. Submit AnswerA 0.010 M solution of ammonia, NH3, has a pH of 10.6 at 25C. What is the concentration of hydroxide ion? (One way to solve this problem is to find the pOH first and then calculate the hydroxide-ion concentration.)Practice Exercise 1If you have an aqueous solution that contains 1.5 moles ofHCl, how many moles of ions are in the solution?(a) 1.0 (b) 1.5 (c) 2.0 (d) 2.5 (e) 3.0
