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.
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.
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 ?
To calculate the unknown molar concentration of CH3NH2 (methylamine) in MeOH (methanol) titrated against a known molar concentration of HCl (hydrochloric acid), you can use the concept of stoichiometry and the balanced chemical equation for the reaction between CH3NH2 and HCl.
The balanced equation for the reaction is:
CH3NH2 + HCl → CH3NH3+ + Cl-
To calculate the unknown molar concentration of CH3NH2, you can follow these steps:
Step 1: Write and balance the chemical equation for the reaction.
CH3NH2 + HCl → CH3NH3+ + Cl-
Step 2: Determine the stoichiometric ratio between CH3NH2 and HCl based on the balanced equation. In this case, the stoichiometric ratio is 1:1, meaning that 1 mole of CH3NH2 reacts with 1 mole of HCl.
Step 3: Measure the volume of the known molar concentration of HCl used in the titration. Let's say this volume is V1 and its molar concentration is C1 (known).
Step 4: Determine the number of moles of HCl used in the titration by using the equation:
Number of moles of HCl = V1 x C1
Step 5: Since the stoichiometric ratio between CH3NH2 and HCl is 1:1, the number of moles of CH3NH2 present in the reaction is also equal to the number of moles of HCl used.
Number of moles of CH3NH2 = Number of moles of HCl
Step 6: Determine the volume of the CH3NH2 solution in MeOH used in the titration. Let's say this volume is V2.
Step 7: Calculate the molar concentration of CH3NH2 (unknown) using the equation:
Molar concentration of CH3NH2 = Number of moles of CH3NH2 / V2
By following these steps, you can calculate the unknown molar concentration of CH3NH2 in MeOH titrated against a known molar concentration of HCl.
To calculate the unknown molar concentration of CH3NH2 in MeOH titrated against a known molar concentration of HCl, you will need to use the concept of stoichiometry and the balanced chemical equation for the reaction between CH3NH2 and HCl.
First, let's write the balanced chemical equation for the reaction:
CH3NH2 + HCl → CH3NH3+ + Cl-
The stoichiometry of the reaction indicates that 1 mole of CH3NH2 reacts with 1 mole of HCl to form 1 mole of CH3NH3+ and 1 mole of Cl-. Therefore, the ratio of moles of CH3NH2 to moles of HCl is 1:1.
The titration involves adding a known volume and molar concentration of HCl to a solution of CH3NH2 in MeOH until the reaction is complete. At the equivalence point, the moles of HCl added will be equal to the moles of CH3NH2 present in solution.
To calculate the unknown molar concentration of CH3NH2, you will need the known molar concentration of HCl and the volume of HCl added at the equivalence point.
Let's denote:
C(CH3NH2) = molar concentration of CH3NH2 in MeOH (unknown)
C(HCl) = molar concentration of HCl (known)
V(HCl) = volume of HCl added at the equivalence point
Using the equation for molarity, which is defined as moles of solute divided by volume of solution in liters, we can set up the following equation based on the stoichiometry of the reaction:
C(CH3NH2) * V(CH3NH2) = C(HCl) * V(HCl)
Since the stoichiometry of the reaction is 1:1, the volume of CH3NH2 added is equal to the volume of HCl added at the equivalence point. Therefore, V(CH3NH2) = V(HCl).
Now, let's rearrange the equation to solve for the unknown molar concentration of CH3NH2:
C(CH3NH2) = (C(HCl) * V(HCl)) / V(CH3NH2)
By substituting the values of C(HCl) and V(HCl) with the known values, and measuring the volume of CH3NH2 added at the equivalence point, you can calculate the molar concentration of CH3NH2 in MeOH.
Remember to use proper units, such as molarity (mol/L) for concentrations and volume in liters, to ensure accurate calculations.