Description
Hi,
This is a chemistry worksheets that I need you to answer.
Please take a look at it, and let me know if you have any questions. Also, I will give you 7 hours extension. so, It will be day and 7 hours till the due expire.
Unformatted Attachment Preview
Purchase answer to see full attachment
Explanation & Answer
Attached.
Surname 1
Your name
Professor’s name
Course
Date
Le Chatelier principle and Equilibrium
Part I. Association/Dissociation of a Precipitate
Q3
CaCl2 (aq) + 2NaOH (aq) -----> Ca(OH)2 (s) + 2 NaCl (aq)
Ca 2+ + 2Cl - + 2Na- + 2 OH+ ---> Ca(OH)2 (s) + 2Na+ +2ClThe Na+ and Cl- will cancel, therefore, net ionic equation is:
Ca2+ (aq) + 2OH-(aq) ----> Ca(OH)2 (s)
Q4
OH- ions react with Ca2+ ions forming a white precipitate of Ca(OH)2 (s). Ca(OH)2 (s) is
sparingly soluble in water and therefore not all OH- ions become part of the precipitate.
Phenolphthalein is added to confirm that there is excess OH- ions present. The solution should
turn pink.
Q5
There is no change when phenolphthalein is added to water since water is neutral.
Q6
Phenolphthalein indicator turned pink because there were excess of OH- ions since there was no
reaction that took p...