Anyone good at Chem??

[94FiveOhCOBRA]

Having trouble with these Acid/Base neutralizatios...anyone know where or what the equations to figure these out??

Example: A 5.00 x 10^2-mL sample of 2.00 M HCl solution is treated with 4.47 g of magnesium. Calculate the concentration of the acid solution after all the metal has reacted. Assume the volume remains unchanged??

Man i hate chemistry some new equation everyday. i'm lost with these though so i could use any help.

 

[94FiveOhCOBRA]

Anyone know some good College level chem helper sites or anything please. Post. I know this isn't the best spot to ask for some school help. but bear with me

 

[05 Roush]

Nonsense! This is just the place. Let's get started with the following web site:

http://www.shodor.org/unchem/basic/ab/#pH

 

[05 Roush]

Skip down to the titrations part. This is the equation you want to use. I take it they are asking for the pH level. Let us know if it's the molar concentration.

 

[SID297]

You beat me to it. I'm a chem major but I haven't done A/B chem in years. The material on the site Jeff listed is very good.

 

[05 Roush]

Originally posted by sid297
You beat me to it. I'm a chem major but I haven't done A/B chem in years. The material on the site Jeff listed is very good.

Thank you! Of course I'm sure you can explain it better than I. I'm more of a formula man. :beer:

 

[Zinc03Cobra]

well, you're going to need a balanced equation first

4HCl(aq) + (Mg2+) -> 4H+(g) + 2MgCl2(aq)

Basically says when you throw this Mg stuff in, you're going to get 4 mols of Hydrogen gas, and 2 moles of Magnesium cholride.

aq = aqueus (ions are floating around as a salt)

Next, I would turn your mL into Liters, molar Concentration is defined as "Moles dived by Liters". It's also best to turn everything into mols. turn your 4.46 grams of Mg into mols as well.. I'm looking through an old chem book of mine and I used to be so good at this stuff, but it's been nearly 3 years since my college chem class.

Definetly try your college help center

good luck.

 

[Cobraguy01]

Its all Greek to me:??:

 

[SID297]

Originally posted by Cobraguy01
Its all Greek to me:??:

Me too, at 3am.

 

[94FiveOhCOBRA]

yea its molar concentration...thanks for the help guys