Question

What is the molarity Br1- in 0.575 M NaBr? What is the molarity Br1- in 0.900 M AlBr₃?

a) For NaBr: 0.575 M; For AlBr3: 0.900 M
b) For NaBr: 0.2875 M; For AlBr3: 0.300 M
c) For NaBr: 0.575 M; For AlBr3: 0.225 M
d) For NaBr: 0.2875 M; For AlBr3: 0.450 M

Answer 1

The molarity of Br- in 0.575 M NaBr is 0.575 M. The molarity of Br- in 0.900 M AlBr3 is 0.225 M.

Step-by-step explanation:

The molarity of Br- in a solution can be determined by looking at the stoichiometry of the compound. In NaBr, there is a 1:1 ratio between Na+ and Br-, so the molarity of Br- is the same as the molarity of NaBr. Therefore, the molarity of Br- in 0.575 M NaBr is 0.575 M.

In AlBr3, there is a 3:1 ratio between Al3+ and Br-. So, to find the molarity of Br-, we multiply the molarity of AlBr3 by the ratio of Br- to AlBr3 (1/3). Therefore, the molarity of Br- in 0.900 M AlBr3 is 0.225 M.