Question

EXERCISES 1. What is the difference between dilution and concentration? T2. What quantity remains constant when you dilute a solution? 3. A 1.88 M solution of NaCl has an initial volume of 34.5 mL. What is the final concentration of the solution if it is diluted to 134 ml? 4. A 0.664 M solution of NaCl has an initial volume of 2.55 L. What is the final concentration of the solution if it is diluted to 3.88 L? 5. If 1.00 mL of a 2.25 M H2SO4 solution needs to be diluted to 1.00 M, what will be its final volume? 16. if 12.00 L of a 6.00 M HNO3 solution needs to be diluted to 0.750 M, what will be its final volume? 7. If 665 mL of a 0.875 M KBr solution are boiled gently to concentrate the solute to 1.45 M, what will be its final volume? 8./1f 1.00 L of an LiOH solution is boiled down to 164 mL and its initial concentration is 0.00555 M, what is its final concentration? 9. How much water must be added to 75.0 ml of 0.332 M FeCl3(aq) to reduce its concentration to 0.250 M? 10 How much water must be added to 1.55 L of 1.65 M SCINO3)3(aq) to reduce its concentration to 1.00 M? ANSWERS

Answer 1

0 Diletion simply meangs decreasing concentraten of any solution by inereasing the voleeme of solution by adding solvent while concentreton meang how much solute is present in given volume of section. moles (amount) of solute remains constant during dilution. Per dilution ! (mdarity x volume) iminal = (molarity xudume ) final Now inital: molarity ; m= 1.88m; volume; U = 34.5mL final! molarity; M= 2 i volume; U= 130mL - 1.88mx 34.5 ML = final polarity X 130mL u. Final molarity = 0.484m (anseve) Initial; vdeeme = 2.582 i molarity = 0.664m final: volume = 3.882 ; molarity = 9 - 0.664 mx 2.55L = Final melarity X3.882 & Final melanity = 0.436m (asowe /