21.46 mL of Iodine I2 was standards with 0.1004 g sample of ascorbic acid. At the blue starch end point, what is the molarity of the iodine I2 solution?
Do you know the equation. You will need that.
moles ascorbic acid = grams/molar mass
Use the equation to convert moles ascorbic acid to moles I2.
M I2 = moles I2/L
so par say i should convert .1004 g ascorbic acid to mole/L.... if so then, is the 12 mole/L the conversion factor here?
The conversion factor comes from the equation of ascorbic acid + I2 ==> ??
To find the molarity of the iodine I2 solution, you need to use the equation relating moles, volume, and molarity. Here is how you can calculate it step by step:
1. Start by calculating the number of moles of ascorbic acid used in the reaction. You can use the equation:
Moles of ascorbic acid = (mass of sample) / (molar mass of ascorbic acid)
The molar mass of ascorbic acid (C6H8O6) can be found in the periodic table or a chemical reference source.
In this case, given that the mass of the sample is 0.1004 g, and the molar mass of ascorbic acid is, for example, 176.12 g/mol, you can calculate:
Moles of ascorbic acid = 0.1004 g / 176.12 g/mol
2. Next, use the balanced chemical equation for the reaction between iodine and ascorbic acid to determine the mole ratio between iodine and ascorbic acid. The balanced equation could be something like:
C6H8O6 + I2 → C6H6O6 + 2HI
From the equation, you can see that 1 mole of ascorbic acid reacts with 1 mole of iodine (I2). So, the moles of ascorbic acid are the same as the moles of iodine.
3. Now, you can determine the volume of iodine solution used in the titration. In this case, it is given that 21.46 mL of iodine (I2) was used.
4. Finally, you can calculate the molarity of the iodine (I2) solution using the equation:
Molarity of iodine solution (I2) = Moles of iodine / Volume of iodine solution (in L)
Convert the volume of iodine solution from milliliters (mL) to liters (L) by dividing by 1000.
Plugging in the values, you have:
Molarity of iodine solution (I2) = Moles of ascorbic acid / (21.46 mL / 1000 mL/L)
Substitute the calculated moles of ascorbic acid and the converted volume of iodine solution to get the molarity.
And there you have it! By following these steps, you should be able to determine the molarity of the iodine I2 solution.