Calculate the concentration (M) of copper in each sample. The Cu^2 standard solution was prepared...

Calculate the concentration (M) of copper in each sample. The {eq}\displaystyle \rm Cu^2 {/eq} standard solution was prepared by dissolving {eq}\displaystyle \rm 3.928 \ g \ CuSO_4 \cdot 5H_2O {/eq} into {eq}\displaystyle \rm 1.000 \ L {/eq} distilled water.

The {eq}\displaystyle \rm NH_4OH {/eq} used in these solutions is {eq}\displaystyle \rm 3 \ M {/eq}. Following are the mixtures for the solutions:

Solution {eq}\displaystyle \rm 1: 7.50 \ mL {/eq} standard {eq}\displaystyle \rm Cu^{2+}: 0.00 \ mL, \ H_2O: 2.50 \ mL \ NH_4OH {/eq}

Solution {eq}\displaystyle \rm 2: 6.00 \ mL {/eq} standard {eq}\displaystyle \rm Cu^{2+}: 1.50 \ mL \ H_2O: \ 2.50 \ mL \ NH_4O {/eq}