Question

want happens when washing soda reacts with hard water​

Answer 1

Answer:

Hard water has an abundance of calcium ions. When washing soda, that is, sodium carbonate is added to hard water, it reacts with the calcium ions to produce a precipitate.

Explanation:

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Answer 2

Answer:

Hard water can be softened by adding washing soda (sodium carbonate) which removes the calcium ions in a precipitation reaction. Alternatively, the hard water can be passed through an ion-exchange resin in a column. Sodium ions replace the calcium ions in the water as it passes through the column.