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
The mols HCl remaining in the flask after the tablet has been neutralized is just M NaOH x L NaOH = mols NaOH = mols HCl because that part of the reaction is
HCl + NaOH ==> NaCl + H2O
No problem! To determine the concentration of HCl remaining in the flask, you need to use the concept of stoichiometry and the balanced chemical equation for the reaction between HCl and NaOH.
First, let's write the balanced equation for the reaction:
HCl + NaOH -> NaCl + H2O
From your information, you have calculated the number of moles of HCl neutralized by the tablet, which is approximately 0.014 moles.
Next, you need to determine the molar ratio between HCl and NaOH from the balanced equation. In this case, the ratio is 1:1, meaning that one mole of HCl reacts with one mole of NaOH.
Since you know the concentration and volume of NaOH added, you can calculate the number of moles of NaOH used in the reaction. The concentration of NaOH is 0.145 moles/liter, and the volume added is 100 mL (which is equivalent to 0.1 liters).
Number of moles of NaOH = concentration * volume
= 0.145 M * 0.1 L
= 0.0145 moles
Since the molar ratio between HCl and NaOH is 1:1, the number of moles of NaOH used is equal to the number of moles of HCl neutralized by the tablet.
Now, you can calculate the volume of HCl in the flask before the reaction. The concentration of HCl is given as 0.14 M, and the volume of NaOH used was 100 mL (0.1 L).
Number of moles of HCl in the flask = concentration * volume
= 0.14 M * 0.1 L
= 0.014 moles
We know that this is the amount of HCl neutralized by the tablet.
To find the concentration of HCl remaining in the flask, you need to divide the number of moles of HCl remaining by the volume of the flask. However, you have not provided the volume of the flask, so it is not possible to calculate the exact concentration of HCl remaining without that information.
I hope this explanation helps you understand how to determine the concentration of HCl remaining in the flask!