I have prepared a caffeine stock solution of 0.075 M. What volume should we mix with distilled water in order to reach a standard solution of 0.0015 M and a final volume of 10 mL?
a) 0.2 mL
b) 112.5 mL
C) 50 ml
d) 2 mL

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.