Question

Please answer 11-16

10. How many sugar molecules are present in 300 mL of a 2.0 M solution? (The formula for sugar is C12H220)Sugar conce mbakxvolme 2.0 x .300 6.6 mol 11. Your teacher asks you to prepare 500 mL of a 2.75 molar solution of Nacioran upcoming laboratory experiment. Write a step-by-step procedure describing how you would carry out this task. 12. When water is added to a solution, the solution will be more diluted. What is the equation for calculating the new molarity after diluting a solution? 13. If a student has 25 ml of NaOH solution that was 0.5 M and adds 275 ml of DI to it, what is the new molarity? 14. If 34 ml of 1.5 M NaCI are put in a flask and the water is added to give a total volume of 500 ml, what is the final molarity? 15. Calculate the molarity of a solution prepared by dissolving 6.80 grams of AgNO, in enough water to make 2.50 liters of solution. 16. How many grams of salt and how many grams of water are needed to prepare 375.0 g of a 4.50 % salt solution? SG4 Page 2 of3 Rev 9/16/16

Answer 1

A solution can be made less concentrated by solution with solvent If a solution of which solvent in water and we need to less concentrated solution then we can add water to this solutions If a solution in diluted from v_1 to v_2 & its molarity of the solution changes to M_1 to M_2, the equation is M_1v_1 = M_2V_2 Moles of solute in original solution 1 = Moles of solve in diluted solution 13) 25 ml 0.5 (M) NaoH solution M_1 = 0.5, v_1 = 25 ml Now 275 ml DI added M_2 = ? & V_2 = 275+25 = 300 ml Therefore M_1v_1 Measure the mass (80.4375g) Add to a 500 ml volumetric add deionized water to under the measuring mark cap it Dissolve the Nael by Shaking and add deionized water up to the 500ml mark