What is a base?
a substance that can donate an h+ ion
a substance that can accept an oh– ion
a substance that is alkaline
a substance that has a low ph value

You have trained year for a marathon. in your first attempt to run a marathon, you decide that you want to complete this 26-mile race in 4-5 hours. a. what is the length of a marathon in kilometers (1mile= 1.6 kilometers). b. what would your average speed have to be to complete the race 4.5 hours? give your answer in kilometers per hour.