During lime softening, the hardness-causing ions are transformed into which form as pH rises?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

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

During lime softening, the hardness-causing ions are transformed into which form as pH rises?

Explanation:
Raising pH during lime softening shifts the carbonate balance in the water so that hardness ions move from dissolved forms to solid precipitates. As lime adds OH−, the carbonate system shifts toward carbonate (CO3^2−), which readily combines with calcium to form calcium carbonate and with magnesium to precipitate as hydroxide/carbonate phases. In short, the hardness-causing ions change from soluble to insoluble as carbonate minerals precipitate, removing hardness from the water.

Raising pH during lime softening shifts the carbonate balance in the water so that hardness ions move from dissolved forms to solid precipitates. As lime adds OH−, the carbonate system shifts toward carbonate (CO3^2−), which readily combines with calcium to form calcium carbonate and with magnesium to precipitate as hydroxide/carbonate phases. In short, the hardness-causing ions change from soluble to insoluble as carbonate minerals precipitate, removing hardness from the water.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy