4. Equal volumes of sodium chloride solution and sodium hydroxide solution (each having concentration of 0.25 mol/dm) are mixed. Calculate the concentrations of (a) sodium ions, (b) chloride ions, (c) hydroxide ions.
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A concentration expressed on an m/m basis is equal to the number of grams of solute per gram of solution; a concentration on an m/ v basis is the number of grams of solute per milliliter of solution. Each measurement can be expressed as a percentage by multiplying the ratio by 100; the result is reported as percent m/ m or percent m/v
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