Answer:
The answer is 7.04278 x 10⁻³, and the log(10) is -2.15
Explanation:
In a 0.887 M NaNO₃ solution there are 0.887 mol in 1 liter of solution, We know that 1 L= 1000 ml, so we can calculate the number of mol which are in 7.94 ml as follows:
solute mol= 7.94 ml x 0.887 mol/ 1000 ml = 7.04278 x 10⁻³ mol
We take log(10) of 7.04278 x 10⁻³ and we obtain: -2.15
