Answers: 1
![K_{eq}=\frac{[H_3O^+][OH^-]}{[H_2O][H_2O]}](/tpl/images/0477/4756/d606a.png)
![K_i=K_{eq}\times [H_2O]}=\frac{[H_3O^+][OH^-]}{[H_2O]}](/tpl/images/0477/4756/af25f.png)
to give new constant known as ionic product of water that is 
.![K_w=K_i\times [H_2O]=[H_3O^+][OH^-]](/tpl/images/0477/4756/99ac0.png)
![[H_3O^+]=1\times 10^{-7} M]=[OH^-]](/tpl/images/0477/4756/63e12.png)
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