Compound B is a chloride of a Period 3 element.
A student carries out the 2 steps below to find the chemical formula of compound B.
Step 1 The student dissolves 5.00×10−4 mol5.00 \times 10^{-4} \text{ mol}5.00×10−4 mol of compound B in water, forming a colourless solution.
Step 2 This solution is titrated against a silver nitrate solution, requiring exactly 60.0 cm360.0 \text{ cm}^360.0 cm3 of 2.50×10−2 mol dm−3 AgNO3(aq)2.50 \times 10^{-2} \text{ mol dm}^{-3} \text{ AgNO}_3\text{(aq)}2.50×10−2 mol dm−3 AgNO3(aq) to precipitate all the chloride ions as a white solid.
Write an ionic equation, with state symbols, for the reaction in Step 2.
Determine the formula of compound B.
