# chemistry

posted by .

Q: Calculate the unknown molar concentration of CH3NH2 in MeOH titrated against a known molar concentration of HCl ?

Could you please answer this, there are lots of examples around calculation PH of two known's but not so much of unknown concentration.

thankyou.

• chemistry -

If you had given some numbers it would have been easier; however, here is the procedure.
1. Write the equation and balance it.
CH3NH3 + HCl ==> CH3NH3Cl

2. mols HCl used = M HCl x L HCl = ?

3. mols CH3NH2 = same as mols HCl (since the equation is 1 mol CH3NH2 to 1 mol HCl).

4. M CH3NH2 = moles CH3NH2/L CH3NH2.
Done.

• chemistry -

thanks, sorry,

10ml of the unknown mixture was titrated

methyl orange was used

it took 7.5ml of 1M HCl (.0074Mol ?)

so this means .00074Mol CH3NH2 / ml ?

## Similar Questions

1. ### Chemistry-Titration

Acid (Unknown) Solution: HCL Molar Ratio: 1:1 Volume:20 ml Concentration:?
2. ### college chemistry

Calculate the [CH3NH3+] of a 7.02×10-3 M solution of the weak base CH3NH2 (make an approximate calculation assuming that initial concentration is equal to the equilibrium concentration). Round your answer to 3 significant digits. …
3. ### chemistry

if 50.0 mLs of HCl of unknown concentration is titrated to neutrality with 90.0 mL of .650 M NaOH. calculate the molarity of the HCl
4. ### CHEMISTRY

A solution of H2SO4(aq) with a molal concentration of 1.94m has a density of 1.119g/mL. What is the molar concentration of this solution?
5. ### chemistry

31.0mL sample of LiOH, concentration unknown, is titrated with .52 M HCl. It takes 42.9 ml of HCl to reach the endpoint. What is the concentration of the base?
6. ### Chemistry

A student completes titration by adding 12.0 mL of NaOH(aq) of an unknown concentration to 16.0 mL of 0.15M HCl(aq). what is the molar concentration of the NaOH(aq)?
7. ### chemistry

CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH …
8. ### Chemistry

Calculate the concentration of bromocresol green (BG) indicator It says that Molar absorptivity = Absorbance at a wavelength/ concentration of BG indicator I am having trouble calculating the concentration of BG. Other info: Stock …
9. ### AP Chemistry

CH3NH2(aq)+H2O(l)=>CH3NH3+(aq)+OH-(aq) Kb=4.4 x 10^-4 Methylamine, CH3NH2, is a weak base that reacts with water according to the equation above. A student obtains a 50.0 mL sample of a methylamine solution and determines the pH …
10. ### chmistry

a aqueous solution of hydrochloric acid has concentration of 37. wt % convert in concentration value to molar concentration if the density of the solution is 1.19g/ml molar mass of Hcl=36.46g/mol t

More Similar Questions