Why does water flow decrease in your shower when someone flushes the toilet

A toilet requires a large amount of cold water to flush. So, when the toilet flushes while you're in the shower, it's stealing from your shower's cold water supply. When the pressure-balancing valve senses the drop in cold water pressure, it responds by restricting the hot water pressure.

the ratio of the conjugate base to the acid required to attain the desired ph.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a