How can I determine the concentration of HCl remaining in the flask after back titration?
Thank you!!
I have been given weight of antacid, concentration and volume of HCl and concentration of NaOH. I've done 3 trials and found the average volume of NaOH.
I'm not sure I understand the question. AFTER back titration you have no HCl remaining.
The amount of HCl remaining after the reaction (probably with an antacid tablet) is determined by back titrating the remaining HCl with NaOH. mols NaOH used in the back titration is M x L = ? and that is the same as the mols HCl.
Then initial mols HCl at the beginning of the experiment minus mols HCl remaining (the back titrated part) = mols HCl used in the neutralization of the tablet.
Sorry if I confused you. I miss-wrote my question.
My question was: How can I determine the concentration of HCl remaining in the flask.
I calculated the # of moles of HCl neutralized by the tablet which was around 0.014 M.
I don't understand the steps needed to calculate the concentration of HCl remaining in the flask.
Given:
Con. of HCl: 0.14M
Volume added:100mL
Con. of NaOH:0.145M
Weight of Tablet: 1.3g
To determine the concentration of HCl remaining in the flask after back titration, you can follow these steps:
1. Calculate the number of moles of NaOH used in the average volume you obtained. This can be done by multiplying the concentration of NaOH by the average volume of NaOH used.
2. Since the reaction between NaOH and HCl is 1:1 (1 mole of NaOH reacts with 1 mole of HCl), the number of moles of HCl used in the reaction is equal to the number of moles of NaOH used.
3. Calculate the number of moles of HCl originally present in the flask. This can be done by multiplying the concentration of HCl by the volume of HCl used.
4. Subtract the number of moles of HCl used in the reaction from the number of moles of HCl originally present to find the number of moles of HCl remaining in the flask.
5. Finally, calculate the concentration of HCl remaining in the flask by dividing the number of moles of HCl remaining by the volume of HCl used.
By following these steps, you will be able to determine the concentration of HCl remaining in the flask after back titration.
To determine the concentration of HCl remaining in the flask after back titration, you will need to follow a series of steps. Here's the process you can follow:
1. Calculate the amount (in moles) of HCl initially added to the flask:
- Use the concentration and volume of HCl to calculate the moles of HCl added. The formula for this calculation is: moles = concentration x volume.
2. Calculate the amount (in moles) of NaOH that reacted with the excess HCl:
- Since you have the average volume of NaOH used, multiply it by the concentration of NaOH to obtain the moles of NaOH used: moles = concentration x volume.
3. Calculate the amount (in moles) of HCl that reacted with NaOH:
- Given that the balanced chemical equation between HCl and NaOH is 1:1, the moles of HCl that reacted with NaOH will be equal to the moles of NaOH used.
4. Determine the amount (in moles) of HCl remaining in the flask:
- Subtract the moles of HCl that reacted with NaOH from the moles of HCl initially added to obtain the moles of HCl remaining.
5. Calculate the concentration of HCl remaining:
- Divide the moles of HCl remaining by the volume of the flask (in liters) to obtain the concentration of HCl remaining. The formula for this calculation is: concentration = moles / volume.
By following these steps, you will be able to determine the concentration of HCl remaining in the flask after back titration.