In class, it was mentioned that at 25 °c, the ph of pure water is 7.00 becuase kw = 1.0 × 10−14. at other temperatures, the ph value of pure water will be different than 7.00 becuase the value of kw changes. suppose that at a temperature different than 25 °c, the ph of pure water was measured and found to be 7.27. what must the value of kw be equal to at this second temperature?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

What is the most important factor in determining climates.

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)