How to determine saturation point of k2Cr2O7?
You need to know the solubility at various temperatures. Usually these values are available in the form of graphs or tables. If you don't have that information, you add, say 100 g K2Cr2O7 to 100 g H2O at say 25 C, let it dissolve as much as it will, filter, dry and weigh the amount that didn't dissolve. The difference is how much dissolved and that is the solubility in 100 mL H2O. Repeat for different temperatures.
To determine the saturation point of K2Cr2O7 (potassium dichromate), you will need to conduct a solubility experiment. Here is a step-by-step guide on how to do it:
1. Begin by adding a known volume of distilled water (e.g., 100 mL) into a beaker or flask.
2. Slowly add K2Cr2O7 crystals to the water while stirring gently. Keep track of the amount of the compound you add.
3. Continue adding the crystals and stirring until you observe no more dissolution or the solution starts to become cloudy.
4. Use a glass rod to check for undissolved crystals. If you can still see solid particles floating in the solution, add more K2Cr2O7 and stir until you reach the point of saturation.
5. Once you notice that no more solid is dissolving and the crystals do not disappear after stirring, saturation has been reached.
6. Make sure to record the total mass of K2Cr2O7 added to reach saturation and the volume of water used.
To calculate the saturation point, you can divide the mass of K2Cr2O7 added by the volume of water used. This will give you the solubility of K2Cr2O7 in terms of grams per milliliter (g/mL) or grams per liter (g/L), depending on the units you choose for the mass and volume measurements.