800times10-3mol of hbr are dissolved in water to make 140l, Ask an Expert

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8.00×10^-3mol of HBr are dissolved in water to make 14.0L of solution. What is the concentration of hydroxide ions,[OH-] , in this solution? and 4.00g of NaOH are dissolved in water to make 2.00L of solution. What is the concentration of hydronium ions,[H3O+] , in this solution?

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