What is the mass of aluminum hydroxide precipitated when draining a solution containing

| June 29, 2021 | education

What is the mass of aluminum hydroxide precipitated when draining a solution containing 30 g of AlCl3 with a slight excess of potassium hydroxide solution?

AlCl3 + 3KOH = Al (OH) 3 + 3KCl.
1) Calculate the molar mass of aluminum chloride. To do this, add up all the atomic masses of the components that make up the substance: 27 + 35.5 * 3 = 133.5.
2) Find the amount of aluminum chloride substance. For this, the mass of the chloride given in the condition of the problem is divided by the molar mass: 30 / 133.5 = 0.22 mol.
3) Find the amount of sediment substance. According to the reaction equation, there is one mole of aluminum hydroxide per mole of aluminum chloride. This means that the amount of sediment substance is 0.22 mol.
4) Sediment weight: 0.22 * 78 = 17.16 g – answer.



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