Question

Part A 2.5 L of a 4.0 M HNO 3 solution is added to water so that the final volume is 8.0 L . Express your answer using two significant figures.

Part B Water is added to 0.45 L of a 6.0 M KOH solution to make 2.0 L of a diluted KOH solution. Express your answer using two significant figures.

Part C A 80.0 mL sample of 8.0 % (m/v) NaOH is diluted with water so that the final volume is 200.0 mL . Express your answer using two significant figures.

Part D A 5.0 mL sample of 50.0 % (m/v) acetic acid ( HC 2 H 3 O 2 ) solution is added to water to give a final volume of 25 mL . Express your answer using two significant figures.

Answer 1

part-A

Before dilution                                                            After dilution

M1 = 4M                                                                        M2 =

V1 = 2.5L                                                                       V2 = 8L

            M1V1 = M2V2

              M2   = M1V1/V2

                      = 4*2.5/8   = 1.3M

part-B

Before dilution                                                            After dilution

M1 = 6M                                                                        M2 =

V1 = 0.45L                                                                    V2 = 2L

            M1V1 = M2V2

              M2    = M1V1/V2

                      = 6*0.45/2   = 1.4M