Calculate the pH of a buffer consisting of 0.50 M HF and 0.45 M F- (Ka of HF = 6.8 x 10 -4). i) Before addition of NaOH.
ii) After addition of 0.40 g of NaOH to 1.0 L of the buffer.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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just did the assignment and the answer was #1 +2 n

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

> b takes place in the gas phase in an isothermal tubular reactor. the feed is one mole of a per one mole of c, an inert. the entering temperature and pressure are 427°c and 10 atm, respectively. the gas constant r = 0.08206 atm · l/mol · k.