maom an learning What is the concentration of an HBr solution if 28.5 mL of a 0.200 M NaOH solution are needed to titrate 55.5 mL of the acid? Number Solution Before dilution                                                     After dilution M1   = 0.2M                                                          M2 = V1   = 28.5ml                                                        V2   = 55.5ml M1V1   = M2V2 M2    = M1V1/V2 = 0.2*28.5/55.5   = 0.1027M final concentration = 0.1027M .

1. maom an learning What is the concentration of an HBr solution if 28.5 mL of a 0.200 M NaOH
solution are needed to titrate 55.5 mL of the acid? Number
Solution
Before dilution After dilution
M1 = 0.2M M2 =
V1 = 28.5ml V2 = 55.5ml
M1V1 = M2V2
M2 = M1V1/V2
= 0.2*28.5/55.5 = 0.1027M
final concentration = 0.1027M