Wow ... 8 posts in 13 minutes, and not a single thought of your own. Please understand that tutors won't do your work for you.
You need to indicate exactly what you have done to work each problem and where you're running into trouble.
a) What is fellesioneffekten?
Veronal is a barbiturate (structure see above). Barbiturates is a substance class which occur in a variety of drug classes, including sleep medications (hypnotikasedativa), in painkillers (anesthetics) and anticonvulsants. A barbiturate is a weak acid. Veronal is usually given in the form of its sodium salt.
b) Determine the pH of a 250 mL solution containing 10 mg of sodium salt of veronal with molecular formula NaC8H11N2O3? For Veronal is Ka = 3.7 x 10-8.
c) As a pharmacist wants you to solve the sodium salt of veronal in a buffer, and you can choose between these two possibilities: i) 0.5M KH2PO4 / K2HPO4 or ii) 0.5 M NaH2PO4 / Na2HPO4. Discuss solubility of sodium salt of veronal in the two buffer systems.
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I read all of these posts. Almost all are solved with the Henderson-Hasselbalch equation, or some variation of the HH equation. I think all of them are buffer problems. I suggest you pick one of them; e.g. the carbonate/bicarbonate problem, show what you have done or what you think. If you have no idea what to do, explain fully, and in detail, what you don't understand about the problem. Perhaps we can help you through it.
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