Antony determine the pH of a solution to be 6.8. What is the concentration of hydronium ions in this solution? Show your work.

Which metals are called noble metals

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

How many grams are in one mole of lead?