Name the compound on the curve above that would make a saturated solution if 115 grams of were dissolved in 100 grams of water at 20 degrees Celsius.

NaBr

KBr

NaNO3

KNO3

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