Answer:
A) The concentration of NO₃⁻ is 0.30 M
B) The concentration of NO₃⁻ is 0.60 M
C) The concentration of NO₃⁻ is 0.90 M
Explanation:
Hi there!
Let´s write the chemical equation for every dissociation reaction:
A) KNO₃ → K⁺ + NO₃⁻
Since 1 mol of KNO₃ produces 1 mol of NO₃⁻, 0.3 mol will produce 0.3 mol NO₃⁻. Then, the concentration of NO₃⁻ will be 0.30 M.
B) Ca(NO₃)₂ → Ca²⁺ + 2NO₃⁻
1 mol of Ca(NO₃)₂ produces 2 mol of NO₃⁻, then, the concentration of NO₃⁻ will be twice the concentration of Ca(NO₃)₂, that is, 0.60 M.
C) Cr(NO₃)₃ → Cr³⁺ + 3NO₃⁻
1 mol of Cr(NO₃)₃ produces 3 mol of NO₃⁻, then, if we have 0.30 mol per liter of Cr(NO₃)₃, we will have 0.90 mol per liter of NO₃⁻
