posted by jeffrey on .
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.
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.
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 ?