My Ksp lab qustion please help me. My HCl consentration is 0.0517M 93.2 79.3 23.

Question

My Ksp lab qustion please help me.

My HCl consentration is 0.0517M

93.2 79.3 23.2 8.4*10^-6 1.1*10^-5 3.1*10^-5 8.2*10^-6 1.3*10^-5 3.8*10^-5 1.3*10^-5 3.2*10^-5 1. We often use phenolphthalein as an indicator for acid-base titrations. Why was methyl orange used in this experiment? (Include pKHin values as part of your answer) 2. A student titrated an analyte that contained solid Ca(OH)2 a. b. c. Would more, less, or the same amount of HCl be required to reach the endpoint? Why? Would the calculated molar solubility be too high, too low, or is it not affected? Will the calculated Ksp value be too high, too low, or is it not affected? 3. Another student overshot the endpoint by several drops. Would the calculated Ksp value be too high, too low, or is not affected? Why? Another student didn't write down the concentration of the standard HCI solution and instead used 0.05 M for the calculations. Would the calculated Ksp value be too high, too low, or is it not affected? Why? Astudent forgot to rinse the pipet with the unknown Ca(OH)2 solution after rinsing with water. Explain how that error will affect the calculated Ksp value. 4. 5. 6. A student determined that the Ksp at 23 C was 2.2 x 106 and at 7.8 x 10 at 100 C. What is the experimentally determined H°,aS", and G"values (show all work.) Using values in appendix D, calculate the errors for H° and S®. Comment on the signs ofaH', S®, and G®. Is there a temperature where G° = 0? If so, what is it?

Explanation / Answer

1) KIn is dissociation constant of the indicator.

For methyl orange PKIn = 3.5

so the indicator range of methyl orange is 3.1 - 4.4 (approx) , it gives colour change in this range.

the experiment must be involving the same pH range so we are using it as an indicator.

Remember: In case of strong acid: we use methyl orange

In case of strong base we use : Phenolphthalein

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