# orgo chem plz help me

• When a solution of sodium hydroxide is added to a solution of ammonium carbonate and is heated, ammonia gas, NH3, is released. Write the net ionic equation for this reactiọn Both NaOh and (Nh4)2CO3 exist as dissociated ions in aqueous solution?

• i think it's general chemistry question

i'm not sure but maybe like this :  • I think u are correct. Thanks so much. I have two more problems that i don't get though.

What is the molarity of a solution made by dissolving 3.4g of Ba(OH)2 in enough water to make 450 ml of solution?

Assume that Ba(OH)2 ionizes completely in water to Ba2+ and OH- ions. What is the ph of the solution?

Thanks.

• hahaha i forget balance the equation NaOH + (NH4)2 CO3 ---> Na + 2 CO3 + 2 NH3 + H20

• .. homework nhiều quá ..

• molarity is mol/L, right?
if it is right, then you need to convert the 450 mL to L (V)
find the MM(molar mass= g/mol) of Ba(OH)2

3.4g x ( 1/MM) x ( 1/V) = molarity
see the units cancel out

3.4g (mol/g) x (1/L) = mol/L

• thanks I got it.

• i forget the part how to find pH
but you should right down the reaction of Ba(OH)2
Ba(OH)2 → Ba + 2OH
and the OH should be 1/2 Ba(OH)2 i guess
then find the pOH
=> pH= 14-pOH

• I don't get it. What do u mean by the Oh should be 1/2 Ba(OH)2 ?

• lovely_allie wrote:I don't get it. What do u mean by the Oh should be 1/2 Ba(OH)2 ?

Allie, see the equation of dissociation of Ba (OH)2, 1 molecule Ba will be equal 2 molecule OH

• yeah I see that. But how can u find the ph from that equation?

Thanx. • oh I got it..thanks..again.

• Thanks so much.....

Last one.

The usual concentration of HCO3- ions in blood plasma is approximately 24 millimoles per/ L (mmol/L). How would you make up 1.00 L of a solution containing this concentration of HCO3- ions?

• lovely_allie wrote:I don't get it. What do u mean by the Oh should be 1/2 Ba(OH)2 ?

you're right .. OH should be Ba(OH)2 not 1/2 Ba(OH)2 cuz Ba(OH)2 ionizes completely in water ..

i'm thinking abt another pH problem that the solution is not ionized completely • can you assist me with the last problem? I have an hr before the hw is due and it's being grade. Thanks.

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