Answer:
c) 0.100M NH3(Kb=1.8×10^-5)+0.100M HCl.
Explanation:
Hello,
In this case a pH of about 5 is what we should look for, thus, we compute the pH of a 0.100M solution of ammonia as:
![NH_3NH_4^++OH^-\\K_b=\frac{[NH_4^+][OH^-]}{[NH_3]} \\K_b=\frac{x^2}{0.100M-x} \\0.100K_b-K_bx-x^2=0\\1.8x^{-6}-1.8x^{-5}x-x^2=0\\x=1.3x10^{-3}M\\[OH^-]=1.3x10^{-3}\\pH=14-log([OH^-])=14-log(1.3x10^{-3})=11.11](https://tex.z-dn.net/?f=NH_3%3C--%3ENH_4%5E%2B%2BOH%5E-%5C%5CK_b%3D%5Cfrac%7B%5BNH_4%5E%2B%5D%5BOH%5E-%5D%7D%7B%5BNH_3%5D%7D%20%5C%5CK_b%3D%5Cfrac%7Bx%5E2%7D%7B0.100M-x%7D%20%5C%5C0.100K_b-K_bx-x%5E2%3D0%5C%5C1.8x%5E%7B-6%7D-1.8x%5E%7B-5%7Dx-x%5E2%3D0%5C%5Cx%3D1.3x10%5E%7B-3%7DM%5C%5C%5BOH%5E-%5D%3D1.3x10%5E%7B-3%7D%5C%5CpH%3D14-log%28%5BOH%5E-%5D%29%3D14-log%281.3x10%5E%7B-3%7D%29%3D11.11)
That pH allows us to identify the methyl red to perform the titration as long as a pH of about 5, based on the equivalence point, is required.
Best regards.
Answer:
Electrons are the only subatomic particles that have a negative charge.
Answer:
See explanation
Explanation:
Recall that;
Speed = Distance/time
Distance = Speed * time
Speed = 200 km/h
Time = 4 hours
Distance = 200 km/h * 4 hours = 800 kilometres
Displacement has to do with distance covered in a specified direction, in this case, the direction is towards Zambales.
Hence, the displacement is 800 kilometres towards Zambales.
