What would you predict about a chemical that has a hydrogen ion concentration of 1 ⋅ 10−12 M?

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ

Which method would be best to separate a mixture of sand and gravel

The limiting reactant(s) appeared to be