After water has been softened, it is close to pH 11; thus it needs to be stabilized by a process known as recarbonation. What small amount of hardness chemical is formed and what is precipitated in this process?

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Prepare for the ADEQ Water Treatment Levels 1 and 2. Study with tailored questions, in-depth explanations, and interactive quizzes. Elevate your skills and ensure exam success!

Multiple Choice

After water has been softened, it is close to pH 11; thus it needs to be stabilized by a process known as recarbonation. What small amount of hardness chemical is formed and what is precipitated in this process?

Recarbonation stabilizes softened water by reintroducing carbon dioxide to lower the pH and shift the carbonate balance so that some hardness remains as dissolved bicarbonate while other hardness precipitates as carbonate. As CO2 dissolves, calcium tends to form soluble calcium bicarbonate in the water, while magnesium tends to form insoluble magnesium carbonate and precipitates.

So the small amount of hardness that remains in solution is calcium bicarbonate, and the portion that is removed from the water as a solid is magnesium carbonate.

After water has been softened, it is close to pH 11; thus it needs to be stabilized by a process known as recarbonation. What small amount of hardness chemical is formed and what is precipitated in this process?

Prepare for the ADEQ Water Treatment Levels 1 and 2. Study with tailored questions, in-depth explanations, and interactive quizzes. Elevate your skills and ensure exam success!

After water has been softened, it is close to pH 11; thus it needs to be stabilized by a process known as recarbonation. What small amount of hardness chemical is formed and what is precipitated in this process?

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