A barium hydroxide solution is prepared by dissolving 1.58 g of Ba(OH)2 in water to make 30.8 mL of solution. What is the concentration of the solution in units of molarity? concentration:

The barium hydroxide solution is used to titrate a perchloric acid solution of unknown concentration. Write a balanced chemical equation to represent the reaction between barium hydroxide and perchloric acid.

chemical equation:

If 19.9 mL of the barium hydroxide solution was needed to neutralize a 7.49 mL aliquot of the perchloric acid solution, what is the concentration of the acid?

concentration:

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Select all that apply. using a value of ksp = 1.8 x 10-2 for the reaction pbcl2 (s) pb+2(aq) + 2cl -(aq). the concentration of the products yield a ksp of 2.1 x 10-2:

Me as soon as possible! me as soon as possible!