23. Calculate the known value of copper when 3g blue vitriol is dissolved in100 ml of solution. (Atomic weight of Cu = 63.54, Mol. weight of CuSO4.5H2O = 249.68). Ans: 0.76345 gm

To calculate the known value of copper when 3g of blue vitriol (CuSO4.5H2O) is dissolved in 100 ml of solution, follow these steps:

1. First, we need to find out how much copper is in one mole of blue vitriol. The molecular weight of blue vitriol (CuSO4.5H2O) is 249.68 g/mol and the atomic weight of copper (Cu) is 63.54 g/mol.

2. To find the proportion of copper in blue vitriol, divide the atomic weight of copper by the molecular weight of blue vitriol: 63.54 g/mol ÷ 249.68 g/mol = 0.2544. This means that 25.44% of the weight of blue vitriol is copper.

3. Now, to find out how much copper is in 3g of blue vitriol, multiply the weight of the blue vitriol by the proportion of copper: 3g * 0.2544 = 0.7632g.

So, the known value of copper when 3g blue vitriol is dissolved in 100 ml of solution is approximately 0.7632g.