If hard water is alkaline, and washing soda is also alkaline, how does adding it to my laundry help soften the water and protect my machine?
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It isn’t the alkalinity that you’re trying to remove with water softening, but rather dissolved minerals (magnesium and calcium usually). Washing powder is sodium carbonate. Dissolved magnesium and calcium ions easily replace sodium, forming insoluble magnesium/calcium carbonate which drops out of the solution.
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