Calculate the number of moles of HCL (aq) added to the sodium thiosulphate
To calculate the number of moles of HCl (aq) added to sodium thiosulfate, you'll need to know the concentration of the HCl solution and the volume of HCl (aq) added.
The number of moles, n, can be calculated using the formula:
n = C * V
where:
n = number of moles
C = concentration of the HCl solution (in moles per liter, or M)
V = volume of HCl (aq) added (in liters)
If the concentration of the HCl solution is given in a different unit, such as grams per liter (g/L), you'll need to convert it to moles per liter (M) before using it in the formula.
To convert from grams per liter (g/L) to moles per liter (M), you'll need to divide the mass of the solute by its molar mass.
Once you have the concentration in moles per liter (M) and the volume in liters (L), simply multiply them together to calculate the number of moles.
Let's say the concentration of the HCl solution is 2.0 M and you added 0.05 liters of HCl (aq) to the sodium thiosulfate:
n = 2.0 M * 0.05 L
n = 0.1 moles
Therefore, the number of moles of HCl (aq) added to the sodium thiosulfate is 0.1 moles.