Hi! I am doing this chemistry lab of solubility curve of a solid investigation and this is for KCl.

The purpose of this lab is to investigate the relationship between the solubility of potassium chloride and the temperature of its solution and to create a solubility curve for an ionic solid.

There is two questions I do not understand...

1) What property of the solution is illustrated at the moment the crystals start forming explain briefly?

and for both of these questions I found a link:

h t t p : / / a w e s o m e n e s s . c a / h i g h s c h o o l / b i n / 1 1 % 2 0 C h e m i s t r y / S o l u b i l i t y % 2 0 C u r v e % 2 0 o f % 2 0 a % 2 0 S o l i d % 2 0 L a b % 2 0 R e p o r t . p d f

Both my questions are under analysis... # 4 and 5

Question 5 is )
According to your graph, which of the following mixtures is a saturated solution and which is an unsaturated solution;
1)100g of KCl in 100mL of H2O at 40°C
2)50g of KCl in 100mL of H2O at 70°C
3) 120g of KCl in 100mL of H2O at 60°C

The website I gave you is another person with the same assignment except it is of KNO3 whereas mine is KCl...I just want to know what I should write for question 4 and for question 5 how do I basically find out if it is saturated or unsaturated...

Please help my lab is due tmw and I am completely clueless about these 2 questions..

I appreciate your time to my heart please help me:)

Thankyou!

oh one more thing on the website what is the black line of on the solubility graph curve??How would I draw mine...I understand the blue one its just the black one...

I understand that you're working on a chemistry lab investigating the solubility curve of potassium chloride (KCl). I'll do my best to help you with your questions!

Let's start with question 4, which asks about the property of the solution illustrated at the moment the crystals start forming. This property is known as the saturation point. A solution becomes saturated when it contains the maximum amount of solute that can dissolve at a given temperature. At the saturation point, any additional solute added to the solution will no longer dissolve and will instead form crystals.

To answer this question in your lab report, you can observe the solubility curve on the graph you have. Look for the temperature at which the solubility of KCl reaches its maximum value. At this temperature, the solution will be saturated, and any further increase in the amount of KCl added will result in the formation of crystals.

Now, moving on to question 5, which asks you to determine whether a given mixture is saturated or unsaturated based on the solubility curve graph. To answer this question, you will need to compare the solubility of KCl at different temperatures with the amounts of KCl given in the mixtures.

First, locate the points on the solubility curve corresponding to the given temperatures (40°C, 70°C, and 60°C). Then, check the solubility values at those temperatures. If the solubility of KCl at a specific temperature is higher than the amount of KCl given in the mixture, the solution is unsaturated because more solute can still dissolve. Conversely, if the solubility of KCl is lower than the amount of KCl given in the mixture, the solution is saturated because all the solute has dissolved.

Using the information from the solubility curve, determine whether each mixture is saturated or unsaturated based on the solubility values and the amounts of KCl given in the mixtures.

Remember to analyze the graph in your own lab report and provide specific values from your own experiment, rather than relying on someone else's results from the link you provided. This will ensure the accuracy of your conclusions.

Good luck with your lab report, and don't hesitate to ask if you have any further questions!