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The solution is composed of 6.6 g of NaH2PO4 and 8.3 g of Na2HPO4 per 355 mL of solution.
Main group metals should have a +3 charge or higher to be considered acidic
Na+→ +1 charge → neutral and will not contribute to pH
- concentration of H2PO4– = concentration of NaH2PO4
6.6 g NaH2PO4 in 355 mL solution
molar mass of NaH2PO4 → 119.98 g/mol
A buffer, consisting of H2PO4- and HPO42-, helps control the pH of physiological fluids. Many carbonated soft drinks also use this buffer system.
What is the pH of a soft drink in which the major buffer ingredients are 6.6 g of NaH2PO4 and 8.3 g of Na2HPO4 per 355 mL of solution?
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