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Given that human saliva has a temperature of around 37°C rather than room temperature, do you...

Given that human saliva has a temperature of around 37°C rather than room temperature, do you think calcium phosphate will be more soluble or less soluble if it is at room temperature? Explain your logic.

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Answer #1

Ans. Calcium phosphate is sparingly soluble in water at room temperature, around 0.002 g/ 100 mL water.

# Calcium phosphate is soluble in dilute acid.

# The pH of pure water decreases with increase in temperature due to gradual increase in the value of dissociation constant of water (Kw) with temperature. For example, the pH of pure water at 25.00C is 7.0 whereas that at 40.00C is 6.75.

# Therefore, due to increase in [H3O+] concertation (or, decrease in PH), the solubility of calcium phosphate at 37.00C (pH = 6.80, approx.) is greater than that of at 25.00C (pH = 7.00).

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