1. A healthy individual has a blood pH measured to be 7.40 at 25°C. What is the concentration of hydronium ions [H?O?] for this healthy person at a blood temperature of 25°C?
2. What it the pH of a buffered solution that has an acetic acid concentration of 0.15 Molar CH?COOH and a sodium acetate concentration of 0.054 Molar NaCH?COO?
3. What is the pH of a 0.25 Molar sodium hydroxide (NaOH) aqueous solution?
4. Why is the salt sodium chloride NaCl a stable ionic compound which is the product of the acid-base neutralization reaction between hydrogen chloride HCl, hydrochloric acid when hydrogen chloride gas is dissolved in water, and sodium hydroxide NaOH? 
5. Why is ammonium cyanide NH?CN not a stable ionic compound, or not a stable salt, generated by the acid-base reaction of hydrogen cyanide HCN and ammonia NH?? 

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