What is the pH of a KOH solution that has [H+] = 1.87 × 10–13 M? What is the pOH of a KOH solution that has [OH− ] = 5.81 × 10−3 M?

What is the pH of a solution of NaCl that has [H+] = 1.00 × 10–7 M?

please include explanation

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.