Lab 9 Cobalt Chloride and LeChatlier's Principle (1)

38. The organic compound 18-crown-6 (see preceding prob- lem) also binds strongly with the alkali metal ions in methanol. K* + 18-crown-6#[complex]* In methanol solution the equilibrium constant is 1.41 x 10. A similar reaction with Cst has an equilibrium con- stant of only 2.75 x 104. A solution is made (in methanol) containing 0.020 mol L each of K* and Cs*. It also contains 0.30 mol L' of 18-crown-6. Compute the equi- librium concentrations of both the uncomplexed K* and the uncomplexed Cs*.

The following is a solubility product expression for Pb(ClO3)4: Ksp= O [Pb4+][CIO3] O [Pb4+][CIO3]4 O [Pb4+][4CIO3-14 O [Pb4+][CIO3] O [Pb4+][CIO3-]¹

. Use stoichiometry to determine the equilibrium [Fe3+] and [SCN-] in each test tube. y = 6170.7x - 0.0153 Solution  0.002M iron(III) nitrate in 1M nitric acid(mL) 0.002M potassium thiocyanate(mL) DI water(mL) Absorbance(A) 1 3 2 1 0.128 2 2 3 1 0.269

10 In a dilute nitric acid solution, Fe" reacts with thiocyanate ion (SCN ) to form a dark-red complex: [Fe(H,O),J + SCN = H,0 + [Fe(H-0),NCS]*" The equilibrium concentration of (Fe(H-0),NCS]" may be determined how darkly colored the solution is (measured by a spectrometer). In one such experiment, 1.0 mL of 0.20 M Fe(NO), was mixed with 1.0 mL of 1.0 X 10 M KSCN and 8.0 mL of dilute HNO, The color of the solution quanti- tatively indicated that the [Fe{H_O),NCS] concen- tration was 7.3 x 10 M. Calculate the formation constant for [Fe(H,O),NCS]

Write the Kc Expression for the Lab’s Reaction Background: The purpose of this lab is to experimentally determine the equilibrium constant, Kc, for the following chemical reaction: Fe3+(aq) + SCN–(aq)   FeSCN2+(aq)   iron(III)     thiocyanate thiocyanoiron(III) When Fe3+ and SCN- are combined, equilibrium is established between these two ions and the FeSCN2+ ion. In order to calculate Kc for the reaction, it is necessary to know the concentrations of all ions at equilibrium: [FeSCN2+]eq, [SCN–]eq, and [Fe3+]eq. You will prepare four equilibrium systems containing different concentrations of these three ions. The equilibrium concentrations of the three ions will then be experimentally determined. These values will be substituted into the equilibrium constant expression to see if Kc is indeed constant.

After adding the water how was the equilibrium affected? If a compound was removed how? Explain the effect of water addition using Le Chatelier's Principle.

i) Silver ion (Ag+) reacts with SCN- ion to form silver thiocyanate (AgSCN). What change will the student observe when a solution containing Ag+ ion is added to the mixture? ii) Briefly explain how your answer to is consistent with Le Chatelier’s principle.

Solve correctly please. (Gpt/ai wrong answer not allowed)

Please write a long paragraph explaining the analysis using the two images attached below Please please please answer as fast as possible

Lactase is an enzyme that breaks down the sugar lactose which is commonly found in dairy products. Some people develop lactose intolerance as they grow older and the amount of lactase enzyme in their gut diminishes. Since the enzyme is commonly found in the gut of humans it can withstand a pH that is very acidic, ranging from a pH of 2-7. A student decided to do an experiment to determine how the pH of a solution affects lactase enzyme activity. Lactase works by breaking lactose into its two component sugars of glucose and galactose.   To conduct the experiment the student prepared a solution of lactose and placed it into 5 different test tubes. A pH buffer solution was then added to each test tube with a pH of 2.0 in the first tube, 4.0 in the second, 6.0 in the third, 8.0 in the fourth, and a 10 pH in the fifth. Next, the enzyme lactase was added in equal amounts to each test tube and allowed to sit for ten minutes white the enzyme reacted with the lactose. At the end of the ten…

Write the equilibrium constant expression in terms of concentrations (Kc) for the following reactionsA.   CH4(g) + H2O(g)  3H2(g) + CO(g)   B.   Zn2+ (aq) + 4OH- (aq)  Zn(OH)42- (aq)   C.  Zn3(PO4)2 (s) 3Zn2+ (aq) + 2PO43- (aq)

Please write a paragraph of the objective stated using the two images attached below Please please answer as soon as possible thank you

Use the data provided to answer the question

n/ilrn/takeAssignment/takeCovalentActivity.do?locator=assignment-take E OWlv2 | Online teaching x [Review Topics] [References] Use the References to access important values if needed for this question. The equilibrium constant, K., for the following reaction is 1.80×10 at 298 K. NH,HS(s) NH3(g) + H,S(g) If an equilibrium mixture of the three compounds in a 4.38 L container at 298 K contains 2.09 mol of NHHS(s) and 0.241 mol of NH3, the number of moles of H,S present is moles. Submit Answer Retry Entire Group 8 more group attempts Next 9:14 10/14 近

Assume we are to tackle a complex equilibria problem using the process we learned in class. In this example, we’re going to look at dissolving CuS in water.  The relevant equilibrium reactions are as follows: CuS   ⇋   Cu2+   +   S2–                                                                                                                                   Cu2+   +   OH–   ⇋   Cu(OH)2 S2–   +   H2O   ⇋   HS–   +   OH–                                                                                                           H2O   ⇋   H+   +   OH– HS–   +   H2O   ⇋   H2S   +   OH– Write 1 mass balance equation.

Please write a paragraph of the complete method in your own words using the two images attached below

-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take S ot ts This question has multiple parts. Work all the parts to get the most points. [References] Phosphorus pentachloride decomposes at high temperatures. PCl5 (g) PC13 (g) + Cl2 (g) An equilibrium mixture at some temperature consists of 3.56 g of PCl5, 4.86 g of PCl3, and 3.59 g of Cl2 in a 1.00-L flask. a If you add 1.31 g of Cl2, how will the equilibrium be affected? shift left shift right no shift will occur pt pts 1 pt b What will the concentration of PC15 be when equilibrium is reestablished after addition of 1.31 g Cl₂? 1 pt [PC15] = mol/L 1 pt Submit 1 pt 1 pt Submit Answer Try Another Version 4 item attempts remaining ent 80 a F4 F2 F3 # SA % Cengage Learning | Cengage Technical Support F5 1 MacBook Air F6 A DII F7 F8 * A F9

Copper (II) Phosphate is extremely insoluble, but forms a complex ion with CN- that can drive the Copper (II) solubility through Le Chatlier’s principle. Given the two reactions below, determine KT.   Cu3(PO4)2 (s)  -->    3 Cu2+ (aq) +  2 PO43-           (aq)             K1=2.05x10-35 Cu(CN)42- (aq)    -->    Cu2+ (aq)   +   4 CN- (aq)                    K2=1.0x10-25   Cu3(PO4)2 (s)  +  12 CN- (aq)  -->  3 Cu(CN)42- (aq)  +   2 PO43- (aq)                 KT=??? 3b. Of the 4 special types of reaction, which one is depicted by K1 and which one is depicted by the reverse of K2?