The acid hydrogen fluoride (hf) can be dissolved in pure water. will the ph of the solution be greater or less than 7?

Since it will form an acid the ph will be less than 7.

Well, both latitude and intensity of light affect temperature because, the higher the light intensity, the higher the temperature and since latitude is the measure of how close you are to the equator, then the closer to the equator you are, the higher the temperature is.