If I add water to 100.0 mL of a 0.15 M NaOH solution until the final volume is 150.0 mL, what will the molarity of the diluted solution be?
0.23 M
0.10 M
1.0 x 105 M
1.0 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