The pH of a substance added to a citrate buffer, y, depending on the ratio of citric acid to sodium citrate, x, can be modeled using the equation y = 6.4 – log x. If the pH of the substance is 6.5, what is the ratio of citric acid to sodium citrate? A.0.79
B. 1.26
C. 5.59
D.7.20

It's A

Yes it's A. 0.79

Step-by-step explanation:

You plug in 6.5 into the y-value since it asks to find the ratio,x, if the pHis 6.5. Then you can solve using a calculator to get 0.79432, or 0.79

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons