The new pH, as measured by Fiona the pH meter, is 4.89, What is the Ka of this u

Question

The new pH, as measured by Fiona the pH meter, is 4.89, What is the Ka of this unknown weak acid? What is K_b? Which of these has a higher entropy: a) N_2(l) or N_2(g), both at 77 K b) N_2(l) at 77 K or N_2(l) at -230 degree C? c) 99 moles of N_2(s) in 2,000 L, or 99 moles of N_2(g) in 3.017 L? Both at 298 K. Daniel asks someone to make a 0.100 M NaOH solution. They carefully weigh out exactly the right amount of NaOH and mix it thoroughly with the exact, correct volume of water. The final solution is 0.092 M. Why?

Explanation / Answer

13. Entropy is a measure of degree of randomness or disorderness present in system. More the randomness higher would be the entropy.

A) gaseous state more disordered. So N2(g) have higher entropy.

B) higher temperature means more randomness. So N2(l) at 77k have higher entropy.

C) more volume means more randomness. So 99 moles of dinitrogen in 3.017 L would have higher entropy.

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