Which focuses on the composition of matter

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Ill give u brainliest pls how is mass of carbon conserved during cellular respiration

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water