{"id":23002,"date":"2022-01-05T05:00:23","date_gmt":"2022-01-05T05:00:23","guid":{"rendered":"https:\/\/assignmenttutors.net\/blog\/chemistry-equilibrium-and-lechateliers-principle\/"},"modified":"2022-01-05T05:00:23","modified_gmt":"2022-01-05T05:00:23","slug":"chemistry-equilibrium-and-lechateliers-principle","status":"publish","type":"post","link":"https:\/\/assignmenttutors.net\/blog\/chemistry-equilibrium-and-lechateliers-principle\/","title":{"rendered":"Chemistry: equilibrium and lechatelier’s principle"},"content":{"rendered":"
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These are practical questions to be done in lab, for writing a solution\/calculation with no values\/experimental results please make an educated guess because the prac is yet to be done. For the other questions please try to be as specific as possible. Read the document I uploaded (it has procedures and other useful material). Cheers.<\/p>\n

\u00a0<\/p>\n

Question 1<\/p>\n

a) Write down the overall equation showing the formation of [Fe(acac)3] from [Fe(H2O)6] 3+ and acetylacetone [Fe(H2O)6] 3+(aq) + 3acacH(aq) [Fe(acac)3](aq) + 6H2O(l) +3H+ (aq).<\/p>\n

\u00a0<\/p>\n

b) What reagent (chemical agent) do you weigh out that ends up being the source of the [Fe(H2O)6] 3+?<\/p>\n

\u00a0<\/p>\n

Question 2<\/p>\n

a) Circle the correct word in bold text to complete the following statements: A pH of less than 7 means a solution is\u00a0acidic\/basic.\u00a0<\/strong>A pH of greater than 7 means a solution is\u00a0acidic\/basic<\/strong>.<\/p>\n

\u00a0<\/p>\n

\u00a0<\/p>\n

b) The equation showing acetylacetone, acacH, forming the acac\u00af ion is below:<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 acacH => acac\u00af + H+<\/p>\n

What is it about this equation that results in a solution of acacH being slightly acidic?<\/p>\n

\u00a0<\/p>\n

c) Given that sodium acetate is a base (remember that sodium acetate can be considered as sodium ions and acetate ions), complete the following equation showing the reaction of acetate ions with H+ :<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0CH3COO\u2013 + H+ => _________<\/p>\n

Question 3<\/p>\n

a) What is the connection between the two equations below?<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 acacH => acac\u00af + H+<\/p>\n

\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 [Fe(H2O)6] 3+ + acac\u00af => \u00a0[Fe(H2O)4(acac)]2+ + 2H2O<\/p>\n

\u00a0<\/p>\n

b) Using your answer to Question 3(a), explain why the pH of a mixture of [Fe(H2O)6] 3+ and acacH is lower than a solution of either of the components by themselves.<\/p>\n

\u00a0<\/p>\n

c) Explain why the pH increases on addition of sodium acetate.<\/p>\n

\u00a0<\/p>\n

d) Therefore, explain why more [Fe(acac)3] is produced after the addition of sodium acetate. (Hint: use the Equation [Fe(H2O)6] 3+(aq) + 3acacH(aq) [Fe(acac)3](aq) + 6H2O(l) +3H+ (aq) \u00a0and Le Ch\u00e2telier\u2019s Principle.) (refer to the document for the principle).<\/p>\n

\u00a0<\/p>\n

Question 4: [Pg 11 on the document, also need to scroll back to Part 1 to answer this]<\/p>\n

\u00a0<\/p>\n

a) Steps 1 and 2 in the PROCEDURE describe test tubes A and B in Diagram 1. Test tube A should contain the neutral [Fe(acac)3] complex synthesised in\u00a0Part One<\/strong>\u00a0and polar water, test tube B should contain [Fe(acac)3] and non-polar dichloromethane. Using the idea of \u201clike dissolves like\u201d, which test tube \u2013 A or B \u2013 do you predict will contain the dissolved [Fe(acac)3]? (Hint: see the notes on solubility in the Introduction section for help.)<\/p>\n

\u00a0<\/p>\n

b) If the intensity of the colour of the solutions can be taken as a rough guide as to the concentration, which solvent layer in test tube B, the top or the bottom, contains the most [Fe(acac)3]?<\/p>\n

\u00a0<\/p>\n

c) Is the layer you chose in question 4 (b) the polar (water) layer or the non-polar (dichloromethane) layer?<\/p>\n

\u00a0<\/p>\n

Question 5<\/p>\n

\u00a0<\/p>\n

a) Complete the equations that describe the stepwise formation of the tris-acac iron complex, [Fe(acac)3]:<\/p>\n

\u00a0<\/p>\n

1) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0[Fe(H2O)6] 3+ + acac\u00af \u00a0 \u00a0 \u00a0 \u00a0=> \u00a0 \u00a0 \u00a0 [Fe(H2O)4(acac)]2+ + 2H2O<\/p>\n

2) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0_________________ \u00a0 \u00a0 \u00a0 \u00a0 => \u00a0 \u00a0 \u00a0 ______________________<\/p>\n

3) \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0_________________ \u00a0 \u00a0 \u00a0 \u00a0 => \u00a0 \u00a0 \u00a0 [Fe(acac)3] + 2H2O<\/p>\n

\u00a0<\/p>\n

For questions 5 b, and question 6, refer to the word document.<\/p>\n

Goodluck.<\/p>\n

\u00a0<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

These are practical questions to be done in lab, for writing a solution\/calculation with no values\/experimental results please make an educated guess because the prac is yet to be done. For the other questions please try to be as specific as possible. Read the document I uploaded (it has procedures and other useful material). Cheers. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-23002","post","type-post","status-publish","format-standard","hentry","category-education"],"_links":{"self":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/23002","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/comments?post=23002"}],"version-history":[{"count":0,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/posts\/23002\/revisions"}],"wp:attachment":[{"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/media?parent=23002"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/categories?post=23002"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/assignmenttutors.net\/blog\/wp-json\/wp\/v2\/tags?post=23002"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}