You are told that the Ka of HNO2 is 4.5 x 10^-4. You want an aqueous solution of HNO2 which has a pH of 2.50. What concentration of HNO2 would you need to take?

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)

What natural processes produce large quantities of co2

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.