Can someone please help me complete these calculations for my lab; I am having some trouble.
A. Standardization of Na2S2O3
-Mass of KIO3 in 100mL = 0.09600g
-Calculate Molarity of KIO3= ?
Please check: 0.09600g/(214.0g/mol)=4.486x 10^-4 mol
-4.486 mol/0.1L= 44.86 M
B. Titration/ Volume of Na2S2O3
1: 38.44 mL
2: 37.23 mL
3: 38.11 mL
Average Volume: 37.93mL
-Calculate molarity of Na2S2O3=?
Not sure what to use as the mass here? Help
C. V of Bleach= 1.020
V of Na2S2O3= 2.010
Calculate Mass of NaOCl/100mL bleach=? Help with this.
Thanks.
I think you have several problems before you start. First, I don't think the M of the KIO3 can be a number such as about 45 M. That's just too large.
Second, have you shown all of your reactions? Usually one doesn't titrate KIO3 with Na2S2O3. Are you adding KI to the solution, then titrating the liberated I2 with Na2S2O3?. If so, where is the equation for the I2?
Third, in the titration step with OCl^-, did you add I2 to that and you titrated the liberated I2 with Na2S2O3? If so you need an equation for that.
Fourth, and final, V of bleach is 1.020 WHAT UNIT and V Na2S2O3 2.010 WHAT UNIT?
A. Standardization of Na2S2O3:
To calculate the molarity of KIO3, you need to use the formula: moles = mass / molar mass.
In this case, you have a mass of KIO3 (0.09600g) and the molar mass of KIO3 (214.0g/mol). Divide the mass by the molar mass to find the number of moles of KIO3: 0.09600g / 214.0g/mol = 4.486 x 10^-4 mol.
Then, to calculate the molarity, use the formula: Molarity (M) = moles / volume (in liters). The volume given is 100 mL, which needs to be converted to liters: 100mL / 1000mL/L = 0.1L.
Finally, divide the number of moles by the volume in liters to find the molarity of KIO3: 4.486 x 10^-4 mol / 0.1L = 4.486 M.
B. Titration/Volume of Na2S2O3:
To calculate the molarity of Na2S2O3, you need to know the mass of Na2S2O3. Unfortunately, the information provided does not include the mass. You will need to refer to your lab notes or experiment procedure to find the mass of Na2S2O3 used in the titration. Once you have the mass, you can follow a similar process as in part A to calculate the molarity.
C. V of Bleach = 1.020:
To calculate the mass of NaOCl/100mL bleach, you can use the formula: Mass = volume x density.
The given volume of bleach is 100 mL, and the given volume of Na2S2O3 is 2.010 mL.
Multiply the volume of bleach by its density (V of Bleach x Density of Bleach) to find the mass of the bleach.
Similarly, you can multiply the volume of Na2S2O3 by its density (V of Na2S2O3 x Density of Na2S2O3) to find the mass of Na2S2O3 used in the titration.
Note: The densities of bleach and Na2S2O3 will need to be obtained from a reliable source.