Answer:
0.0196
Explanation:
The Total volume of the solution = Volume of 
= 10 mL + 10 mL + 10 mL+ 10 mL + 1 mL + 10 mL
= 51 mL
The concentration of ![[H^+] = \dfrac{ mL \ used \times 0.1 \ M}{total \ volume}](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%20%5Cdfrac%7B%20mL%20%5C%20used%20%5Ctimes%200.1%20%5C%20M%7D%7Btotal%20%5C%20volume%7D)

= 0.0196
<span>The best choice is hypochlorous acid nitrous acid (HNO2) because it has the nearest value of pK to the desired pH.
pKa of </span>nitrous acid<span> is 3.34
If we know pKa and pH values, we can calculate the required ratio of conjugate base (NO2⁻) to acid (HNO2) from the following equation:
pH=pKa + log(conc. of base)/( conc. of acid)
</span><span>3.19=3.34 + log c(NO2⁻)/c(HNO2)
</span><span>3.19 - 3.34 = log c(NO2⁻)/c(HNO2)
-0.15 = log c(NO2⁻)/c(HNO2)
c(NO2⁻)/c(HNO2) = 10⁰¹⁵ = 1.41
</span>
Answer:
This is based on most likely so it's A.Fe
The answer is D: Salt and Water