National Dental Examining Board of Canada (NDEB) Practice Exam

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Prepare for the National Dental Examining Board of Canada (NDEB) Test. Study with flashcards and multiple choice questions, each question offers hints and detailed explanations. Achieve success in your exam!

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What chemical is used to retard setting in alginate?

Potassium sulphate
Sodium phosphate
Calcium chloride
Magnesium sulfate

The correct answer is: Sodium phosphate

Sodium phosphate is used to retard the setting in alginate. The other options, potassium sulphate, calcium chloride, and magnesium sulfate, are commonly used in dental materials but do not have the same retarding effects on alginate.