PLEASE HELP FAST! WORTH 13 POINTS! A student was titrating a 18.00 mL sample of HCl with Ca(OH)2. To reach the endpoint of the titration and neutralize all of the HCl, the student added 49.62 mL of 0.150 M Ca(OH)2. What was the concentration of hydrochloric acid?

to make a supersaturated solution, make a saturated solution of sugar by adding 360 grams of sugar to 100 ml of water at 80 degrees celsius. when the water cools back down to 25 degrees, that 360 grams of sugar will still be dissolved even though the water should only dissolve 210 grams of sugar.

the answer is c i believe

the answers would be

the first one and the second one

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).