1. i have a concentration of 300g of sugar for every 100 ml of water. what is the lowest possible temperature i would need to dissolve that much sugar?

64 °C

Explanation:

I’m guessing that “they” are asking you to interpret a solubility curve something like the one below.

Find the point at 300 g/100 mL water on the vertical axis.

From there, draw a horizontal line until it meets the solubility curve of sugar.

Then, drop a vertical line to the temperature axis.

It appears to hit the axis at about 64 °C.

The solution is saturated at this temperature, so 64 °C is the lowest temperature at which you can dissolve 300 g of sugar in 100 mL of water.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.