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1. Find pH of buffer

The Henderson-Hasselbalch equation is pH = pKa + log([A-]/[HA]) However, I don't know the pKa because no constant is given. Gah. I still don't know what to do.
2. Find pH of buffer

Homework Statement A buffer is made by dissolving 13.0g of sodium dihydrogen phosphate, NaH2PO4, and 15.0g of disodium hydrogen phosphate, Na2HPO4, in a litre of solution. What is the pH of the buffer? a) 7.84 b)7.47 c)7.20 d)6.85 e)6.63 Homework Equations pH = -log [H+]...
3. Find molarity, seemingly simple but I can't do it.

Borek - I appreciate your attempt to help, but I however made a mistake in reading the question. Turns out "molality" was not a typo for "molarity" and the two mean different things. My bad.
4. Find molarity, seemingly simple but I can't do it.

Homework Statement Lauryl alcohol, C12H25OH, is prepared from coconut oil; it is used to make sodium lauryl sulfate, a synthetic detergent. What is the molarity of lauryl alcohol in a solution of 17.1g lauryl alcohol dissolved in 148g ethanol, C2H5OH? a) 0.310m b) 0.620m c) 0.842m d)...