Lab 6

68

Active / Medical Chemistry – Dr. Marwa Nizar Prepare 500ml of 0.01M solution of Na from Na,CO3. And what is a pNa* ? At.wt : N=23 , C= 12 ,0= 16.

If you're repeatedly dissolving KNO3 in water, heating it to dissolve the KNO3, and cooling it to observe crystal formation, what would happen to the Ksp if not all of the KNO3 dissolved?

Consider the follaina unbalanced equation: Cag(PO),6) +H, SOy a>CaSO)+H, PO, ex) What masses of calcium sulfate and phosphonic acid can be producad from the neaction of li0, kg calcium phosphate with li0 ka concentrated sul furic acid (98% H, SO4 by mass)? H18

8 (a)

A student is assigned the following chalcone synthesis with starting materials 0.09 moles of A and 0.09 moles of B: CI NaOH A B 1. Determine the amount both the starting materials A and B that should be used in grams. (0.5pts) 2. Determine the amount both the starting materials A and B that should be used in mL if they are liquid chemical. (0.5pts) 3. Provide the Structural Formula (line structure like starting materials A and B) and Molecular Weight of the expected chalcone product. (0.5 pts) 4. Calculate the theoretical yield of the chalcone product in grams. (0.5 pts)

8-

stoichiometric mass Calculate the We used 100cm³ of Ca (014) ₂ (a(OH)₂ con (0₂ (g) of CaCO3. Given Lea(OH)₂ = 4.86 x 10-² soluby sta (a (0₂ (5) H₂0 (1)

Standardization of a Solution A 50.00 mL aliquot portion of 0.01020 M KIO3 solution was transferred into a conical flask. After adding 2.0 g KI and 2 mL of 6M HC1, the mixture was titrated with 31.32 mL of the Na2S2O3 solution to the starch end point. Calculate the number of mmoles of IO3-. mmoles 103- How many mmoles of 12 was released after the addition of KI? mmoles I₂ How many mmoles Na2S2O3 reacted with the 12 produced? mmoles Na2S2O3- What is the molarity of the Na2S2O3 solution? M Na2S2O3 Write the half reaction representing the transformation of OC1- (hypochlorite ion) to Cl-(chloride) in acidic medium. Reduction Half Reaction: Write the half reaction representing the transformation of 1- (iodide ion) to 12 (iodine) in acidic medium. Reduction Half Reaction: Analysis of Household Bleaching Agent The composition of a commercially available household bleaching agent is advertised as 5% (w/v) NaOC1. . Calculate the number of mmoles of NaOCl present in 50 mL of the bleaching agent.…

(b) Using appropriate chemical reactions for illustration, show how calcium present               as the dissolved HCO3- salt in water is easier to remove than other forms of                     hardness, such as dissolved CaCl2.      (c) A water has the following analysis: mg/l​ mg/l Na+ - 20                     Cl- - 40       K+ - 30                        HCO3- - 67 Ca2+ - 5                       CO32- - 0 Mg2+ - 10                   SO42- - 5 Sr2+ -2                         NO3- - 10 What is the total hardness, carbonate hardness and noncarbonated hardness in mg/l as CaCO3.​

mass Br- = 5.32 * 103* 79.904 = 0.4255 g. Os : What concentration Of Fez(SO4)3 (aq) is required for the olution to have [Fe*3 lag)] = 0.32M ? ) 0.16 M. %3D 0.080 M. 0.32 M.

2 - if the concentration of [Lit] were doubled (Say by adding a soluble Li Salt Such highly as LiI), what would be the new concentration Of [CO3=-] in the saturated Soluticn? If [CO] was doubled instead by adding Salts Such as Csz CO3, what would be C-.८०% ) the new concentration of [Lit] in the Saturated solution?

How many mg of Ag2SO4 dissolve in 0.3 M, 500 mL of Al2 (SO4) 3 solution? Compare this solubility with the solubility in purified water and 0.1 M Al2 (SO4) 3 solution. (Ksp = 1.10-5)

Plz do Asap....!

iv. Does sucrosebehavelikeastrong electrolyte, weakelectrolyte, ornonelectrolyte whenitis dissolved in water? What species are present inC12H22O11(ag)?

What is the concentration of PO43 ions in a satured solution of Mg3(P04)2? The Ksp of Mg3(PO4)2 is 1.04 x 1024. -10 2.55 x10 M Incorrect

Two different proteins X and Y are dissolved in aqueous solutionat 37 °C. The proteins bind in a 1:1 ratio to form XY. Asolution that is initially 1.00 mM in each protein is allowedto reach equilibrium. At equilibrium, 0.20 mM of free X and0.20 mM of free Y remain. What is Kc for the reaction?

2

Draw the structure

Yerleştirme Görüntü Paylaş Pencere Yardım Report Fe spectro 2 %125 Ekle Tablo Grafik Metin Ortamlar Yorum Answer the following questions. 1) The 40 mg/L Fe stock solution was prepared with iron (II) ammonium sulfate hesahystoate [Fe(NH.):(SO.):(H;O)«] rather than with iron (II) chloride [FeCl:). What is the reason of this choice? 2) For convenience, several glass or quartz cells are generally used spectrophotometrie analyses; these cells should be "matched" with regard to their.optical properties. a) Why they should match with each other? b) Suppose one of the cells has a light path that is slightly longer than the usual 1.00 cm. How would this affect the results of an analysis if the defect was not recognized? c) Explain how the "unmatched' cell problem can be solved? 3) Draw the scheme of single bcam spectrophotometer and state the function of each compartment sepcrately.

determine the sterocenters and R/S

(5) A standard sclution of hydrated iron(II) sulphate, FeSO,.XH20, was preparcd by dissolving 5.8 g of the salt in a volumetric flask and making it up to 250 mL (250 cm³). Twenty-five millilitres (25 mL (25 cm³)) of this solution was acidified and found to react exactly with, 22.8 cm³ (22.8 mL), of 0.018 M potassium 3 permanganate solution. The half-equations for the reaction are: JAS 00 MAC aJTT MNO4 (aq) + 8H*(aq) Fe*(aq) + Mn2“(aq) + 4H20(1) → Fe*(aq) + e MOTTAMIMAXE 2+ (i; What is the indicator for the titration of a solution of iron (II) sulphate and potassium permanganate soluticn? (ii) Indicate the colour at the end point if the permanganate is in the burette. blood ofieido rosd sl (iii) Why is it necessary to acidify the iron(II) solution before titration? o sd am eorsiuols

The Ksp values of two solid carbonates, A2CO3 and BCO3, were determined by preparing 250.0-mL saturated aqueous solutions of both solids and then determining the concentration of carbonate by titrating it with 0.01023 M HCl up to methyl orange endpoint. Solutions of A2CO3 and BCO3 required 6.184 mL and 3.456 mL of the titrant, respectively.d. Instead of distilled water, 250.0 mL of 0.10 M ANO3 was used to prepare a saturatedsolution of A2CO3 while 250.0 mL of 0.10 M B(NO3)2 was used for BCO3. Which will have a higher solubility?

A stock solution contains 0.058 mM glucose. To 218 uL of this stock solution was added: 607 uL buffer, 25 uL enzyme solution and 100 uL cofactor solution. What is the concentration of glucose in this mixture?

c) n* Q7: To prepare [Co(NH)SCIJCH, the following procedure was wsed 17 g of CoCl2.6H20 powder was portion-wise added to a solution of 10 gof concentrated aqueous ammonia. To the obtained brown Co slurry, 16 ml S wise added. When the effervescence has ceased, add 60 ml conc. HCl slowly than 70 C. Hold the temperature between 55 C and 65 C for 15 min. Add Som the solution to cool to room temperature. Collect the product by suction filaration Calculate the theoretical yield 15.1 g 22.4 g 20.0 g 17.9 g 21.1 g

My Home x Alabame A Activity O Dashboard x G is hbr ac O (123) Nc gnment/takeCovalentActivity.do?kocator-assignment-take 身 引ロ [Review Topics] [References) Use the References to access important values needed for this question. The equilibrium constant, Kc, for the following reaction is 1.80x10 2 at 698K. 2HI(g) H2(g) + I2(g) If an equilibrium mixture of the three gases in a 18.3 L container at 698K contains 0.236 mol of HI(g) and 0.397 mol of H2, the equilibrium concentration of I, is M. Submit Answer Retry Entire Group 1 more group attempt remaining Previous Next 21:25 ENG 令 口 US 5/5/2022 End Insort Home 8 9. R T

7. If the equilibrium constant of binding of NADH to an enzyme [E] is 2.7=2,7 v Ko = [NADH][E]/[E-NADH] = 1.5 x 10-6 M, and solution concentrations of [E] and [NADH] are 10 nM and 1.0 µM, respectively, what is the concentration of the [E-NADH] complex? %3D 51210 (a) 16 µM0.:0 (b) 0.62 x 109 M 1.5 E-NADH (c) 62 nM .0000000 (d) None of the above. 5 -2.51x

The Ksp values of two solid carbonates, A2CO3 and BCO3, were determined by preparing 250.0-mL saturated aqueous solutions of both solids and then determining the concentration of carbonate by titrating it with 0.01023 M HCl up to methyl orange endpoint. Solutions of A2CO3 and BCO3 required 6.184 mL and 3.456 mL of the titrant, respectively. a. What are the concentration of carbonate in each of the saturated solutions of A2CO3and BCO3?b. What are the Ksp values of A2CO3 and BCO3? c. If 8.721 mg A2CO3 and 1.769 mg BCO3 were needed to prepare the saturated solutions, what are the identity of A2CO3and BCO3 ?Hint: deduct the molecular weight of carbonated. Instead of distilled water, 250.0 mL of 0.10 M ANO3 was used to prepare a saturatedsolution of A2CO3 while 250.0 mL of 0.10 M B(NO3)2 was used for BCO3. Which will have a higher solubility?

Solution for 0.105g of the K3[Fe(C2O4)3] (MW= 437.2 g/ mol) were dissolved in sulfuric acid and got rated with 9 mL of 0.028M KMn04. What is the experimental weight percent of oxalate in the sample?

Predict the product(s) for the following reaction. M9CO (s + heat 3. a. 2. (6 )0ɔ + (s)%o6w Mg0( s) + CO 2. b. Mg( s) + CO ( g) + c. 2. (6,%% Mg 2+(s) + co ( 2 (6)%0 + (6 2' E. No reaction occurs.

5) Which of the following would you use to convert CI to Cl2? Clatg) + 2 e > 2 CH(ag) E° = 1.36 V a. Bra() b. H:O:(ag) c. Cu'(ag) d. Au(s) Br2() + 2 e > 2 Br(ag) E°- 1.09 V H:O:(aq) + 2 H+ +2 e > 2 H;O() E° = 1.78 V Cu'(aq) + 2 e > Cu(s) E° - 0.52 V Au"(ag) + 3 e → Au(s) E°- 1.50 V