# Chemistry

posted by .

A solution is prepared by dissolving NH3(g) in water according to the following equation. NH3(g) + H2O(l)=NH4^+(aq)+ OH^-(aq)

If the pH= 9.60 what is the [OH-] in the solution.

• Chemistry -

pH + pOH = pKw = 14. You know pH, solve for pOH and convert to OH^-.
pOH = -log(OH^-).

• Chemistry -

is this right
pH+pOH =14
pOH=14-9.60=4.4
[OH-] =10^-pOH
[OH-] = 10^-4.4 NOW IM STUCK?

• Chemistry -

I'm stuck there too Ryan

• Chemistry -

pH + pOH = 14
9.60 + pOH = 14
pOH = 14 - 9.60 = 4.40
pOH = 4.4 = -log(OH^-)
-4.40 = log(OH^-)
Key in -4.4 on your calculator and hit the 10x button. It should return 3.981E-5 which I would round to 3.98E-5.

• Chemistry -

I get error when I type in -4.4 log and when I put in 4.4 I get 0.6434

• Chemistry -

I got error also

• Chemistry -

You aren't following instructions. I did NOT say take the log of -4.4. Doing that gives you an error message. You want the NUMBER whose LOG is -4.4. To get that you DON'T punch in the log of -4.4. You key in -4.4 and hit the 10x button (that's 10^x button). That give you the number whose log is -4.4. Your display should read 3.98E-5. You may have seen this notation, which is the same thing, as (OH^-) = 10-4.40.
(Note that if you punch in 3.98E-5 and hit the log key, you will get -4.4).

## Similar Questions

1. ### Chemistry

How do I make NH3 to NH4? How would write an ionic equation?
2. ### chemistry

Write a net ionic equation for the reaction of the aqueous species ammonia and hydrofluoric acid. I don't think mine is coming out right- I don't know how NH3 reacts with other species, because I end up getting hydrogen as both an …
3. ### Chemistry

Calculate the end point pH, when 25 mL of 0.01 mol/L HCl solution reacts exactly with 25 mL of 0.1 mol/L NH4OH solution. NH3 Kb = 1.8 x 10^-5 This will be the pH of NH4Cl solution. NH4+ + HOH ==> NH3 + H3O^+ Ka = Kw/Kb = (NH3)(H3O^+)/(NH4^+). …
4. ### chemistry

A solution is prepared by dissolving 15.0 g of NH3 in 250.g of water. The density of the resulting solution is 0.974 g/ml. The mole fraction of NH3 in the solution is?
5. ### CHEMISTRY

A solution is prepared by dissolving 15.0 g of NH3 in 250 g of water. The density of the resulting solution is 0.974 g/mL. The mole fraction of NH3 in the solution is __________. A) 16.8 B) 0.940 C) 0.0597 D) 0.922 E) 0.0640
6. ### chemistry

What is the pH of a buffer system prepared by dissolving 10.70 grams of NH4Cl and 25.00 mL of 12 M NH3 in enough water to make 1.000 L of solution?
7. ### chemistry

what is the Molarity (M) of a 0.87m aqueous solution of ammonia, NH3?
8. ### Chemistry

A buffer solution is prepared by mixing 50.0 mL of 0.300 M NH3 with 50 mL of 0.300 NH4Cl. The pKb of NH3 is 4.74. NH3 + H2O-> NH4+ +OH- 7.50 mL of 0.125 M HCl is added to the 100 mL of the buffer solution. Calculate the concentration …
9. ### chem

Calculate the equilibrium concentration of NH3,Cu^2+,[ Cu(NH3)]^2+ ,[Cu(NH3)2]^2+,[Cu(NH3)3]^2+,and[Cu(NH3)4]^2+ in a solution made by mixing 500.0 ml of 3.00 M NH3 with 500.0 ml of 2.00*10^-3 M Cu(NO3)2. The sequential equilibria …
10. ### Chemistry

Hello I need help with this excersise: How many moles of NH4Cl are neccesary to add to 1 liter of solution of Co2+ 0,20 M in order to prevent the precipitation when the solution is saturated with H2S (0,1M) and the pH is 7,50. It 's …

More Similar Questions