Answer: C. HNO3 and NaOH
Explanation:
Arrhenius acid produces hydogen ion (H+) when dissolved in water. An example of Arrhenius acid is HNO3.
Arrhenius base produces hydroxyl ion (OH-) when dissolved water. An example of Arrhenius base is NaOH.
Answer:
B) nitrogen
the Earth's atmosphere is mostly nitrogen
50 mL of 2.0 M of
and 25 mL of 2.0 M of
were mixed to make a solution
Final volume of the solution after dilution = 200 mL (given)
Final concentration of
, [
] = 
Final concentration of
, [
] = 
Using Hasselbach- Henderson equation:
![pH = pK_a+ log \frac{[salt]}{[acid]}](https://tex.z-dn.net/?f=pH%20%3D%20pK_a%2B%20log%20%5Cfrac%7B%5Bsalt%5D%7D%7B%5Bacid%5D%7D)

Substituting the values:



Hence, the
of the final solution is 7.15.