Re: Does the pH of water affect it's freezing point?

For a simple answer, yes. For the reason, read on:

Pure water contains only water molecules and nothing else dissolved in it, 
such as NaCl (table salt) or HCl gas (to make hydrochloric acid). Pure 
water has a pH of 7 and a freezing point of 0 deg. C. When something is 
dissolved in water, many times this will affect pH and the freezing point. 
Let's look at sea water. Sea water is basically salt water with other 
"stuff" dissolved in the water as well. The pH of sea water is about 8 and 
the freezing point is below 0 deg. C. So, it's not necissarly the pH that 
affects the freezing point of water, but the substance that's dissolved in 
the water which alters the pH.