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# Worksheet 5 â Solutions, Electrolytes and Concentration The name ...

Worksheet 5 â Solutions, Electrolytes and Concentration The name ...

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Units of Concentration - Molarity is a measure of the number of moles of soluteper 1. L of solution. It is given the symbol M and has units of mol/L.1. A bottle is labeled as 2.5 M Ca(OH) 2 .a. What is the concentration of Ca 2+ (aq)?b. What is the concentration of OH - (aq)?c. When you measure out 250 mL of this solution, how many moles ofCa 2+ and OH - will be present?d. How many grams of Ca 2+ and OH - will be present in 250 mL?e. We now add enough water to give a total volume of 1.00L. What isthe concentration of Ca(OH) 2 in this solution.2. How many grams of NaOH must be weighed out to make 250.0 mL of a0.100 M solution of NaOH?a. Start with what you know, the final volume and concentration of thesolution. Arrange these factors to calculate the moles of NaOHneeded.b. Change moles of NaOH to grams of NaOH.

3. Calculate the molarity of a solution of CO 2 in water, which contains 0.145g of CO 2 per 100. mL of solution.4. What are the molarities of the ions in the following mixture?50.00 mL of 0.100 M CuSO 4 mixed with 200.0 mL of 0.040 M K 2 SO 4 ?a. Calculate the number of moles of Cu 2+ and SO 4 2- from the firstsolution.b. Calculate the number of moles of K + and SO 4 2- from the secondsolution.c. Calculate the volume of the mixture.d. Calculate the molarity of all of the species in solution.5. How would you prepare 2.00 L of a 0.250 M solution of NaOH from a 1.00M stock solution of NaOH?Hint: moles of solute before dilution = moles of solute after dilution

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