a 15.00mL sample of NaOH was titrated to the stoichiometric point with 17.40mL of 0.2340M HCl.
a) what is the molar concentration of the NaOH solution?
b)calculate the grams of NaOH in the solution.
This is not a site to do the homework for you. Post an answer and we will comment. I have shown you how to approach these in previous posts.
oh, i'm sorry, i was not able to see your answer on my previous question right away. i was posting my questions first, hoping to have answers right a away even with just one of my posts. i'm sorry.
and thank you, i'm now using what you told me. :)
To find the molar concentration of the NaOH solution, we can use the concept of stoichiometry and the volume and concentration of the HCl solution.
a) To find the molar concentration of the NaOH solution (CNaOH), we can set up an equation using the stoichiometry of the reaction between NaOH and HCl. The balanced equation for the reaction is:
NaOH + HCl -> NaCl + H2O
From the balanced equation, we can see that the mole ratio between NaOH and HCl is 1:1. This means that the number of moles of NaOH is equal to the number of moles of HCl used in the titration.
First, we need to calculate the number of moles of HCl used:
Number of moles of HCl = Volume of HCl (in L) * Concentration of HCl (in mol/L)
Number of moles of HCl = 0.01740 L * 0.2340 mol/L
Now, since the mole ratio between NaOH and HCl is 1:1, the number of moles of NaOH is equal to the number of moles of HCl used in the titration.
Number of moles of NaOH = Number of moles of HCl
Next, we can calculate the molar concentration of the NaOH solution:
Molar concentration of NaOH = Number of moles of NaOH / Volume of NaOH (in L)
Molar concentration of NaOH = Number of moles of NaOH / (15.00 mL / 1000 mL/L)
b) To calculate the grams of NaOH in the solution, we can use the molar mass of NaOH.
First, calculate the number of moles of NaOH:
Number of moles of NaOH = Number of moles of NaOH from point a)
Next, calculate the grams of NaOH:
Grams of NaOH = Number of moles of NaOH * Molar mass of NaOH
To find the molar mass of NaOH, we add up the atomic masses of Na (sodium), O (oxygen), and H (hydrogen) from the periodic table.
After obtaining the molar concentration of NaOH and the grams of NaOH, we can round the values to the appropriate number of significant figures.