Saturday
May 18, 2013

# Posts by tara

Total # Posts: 300

chemistry
the molar solubility of PbS, in a 0.150 M ammonium sulfide (NH4)2S solution is? The Ksp for PbS= 3.2E-28.

chemistry
calculate the pH of a 1.94M solution of nitrous acid (HNO2 - ka = 4.5E-4).

chemistry
the activation energy is 31.7kj/mol. if the reaction rate is 7.4E-2 at 35.0 degrees c, what is the reaction rate constant at -55.0 degrees c.

chemistry
for a given reaction, the activation ener

chemistry
I am doing a boiling point problem and dont know the value of i for the equation delta T = i(kb)(m) solution contains 45.0g caffeine in 25.0 g benzene.

chemistry HELP
laboratoories order hydrochloric acid as a concentrated solution (e.g. 36% W/V). what initial volume of concentrated laboratory hydrochloric acid should be diluted to prepare 5.00L of a 0.12 mol/L solution for an experiment? plz can someone show me how to do it step by step .....

chemistry need help plzzz tomorrow is a TEST!!!
phosphoric acid is the active ingredient in many commercial rust-removing solution.calculate the volume of concentrated phosphoric acid (14.6 mol/L)that must be diluted to prepare 500mL of a 1.25 mol/L solution. how can i calulate the volume cocentration for this question.... ...

art
no he is a composer