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- Ans. 17.15 mg. 54) A 1.000-g sample of a mixture which contains only NaCl and KCl gare a precipitate of AgCl which weighed 2.000 g. What are the percentages of Na and K in the mixture? ins 10 g Ans. 44.77% K; 5.75% Na. 1:J 55. I- can be sernarated from othor45. Fig. 9 presents a plot of change in KNO3 solubility in water with increasing temperature. This plot shows the concentration of the saturated solution expressed in g of KNO3 per 100 g of H2O. Calculate the molarity of this solution at 30ºC knowing that the density at this temperature equals 1.25 g/cm³. 100 90 Fig. 9, Change in KNO3 solubility in water with increasing temperature A. 12.4 mol/dm³ B. 5.0 mol/dm³ C. 4.0 mol/dm³ D. 3.6 mol//dm³ E. 1.8 mol/dm³ solubility g of KNO3 in 100g of H₂O 80 70 60 50 40 30 20 10 0 0 10 20 30 30 40 50 60 70 temperature/°Cill have C. would be m luble in an 2.16 g/mc issolved i 1x10-3 nia has a .63 aturated s he solubil 0.17. ressure of went holes of v p. 43.0 d in oil c g of dipl .14 °C 1 .00 °C/1 b. 27 23. Tertiary butyl chloride undergoes substitution by hydroxide ion according to the equation below. (CH3)3CCI + OH → (CH3)3COH + CI Experimental evidence showed that the reaction obeys the rate law, Rate = k [(CH3)3CCI]. Which of the following mechanisms is consistent with the observed rate law? Step 1-(CH3)3CCI + OH → (CH3)3C + HOCI Slow Step 2 -(CH3)3C + HOCI b. Step 1 -(CH3)3CCI (CH3)3C + Ch Slow (CH3)3COH + Cl Fast Step 2 -(CH3)3C + OH (CH3)3COH Fast c. (CH3)3CCI + OH → (CH3)3COH + Cl d. Step 1 -(CH3)3CCI→ (CH3)3C + Cl Fast Step 2 - OH → H+0² Slow Step 3 -(CH3)3C+0²+H(CH3)3COH Fast e. Step 1 -(CH3)3CCI + OH (CH3)3C + HOCI Fast Step 2 -(CH3)3C + HOCI→ (CH3)3COH + Cl Slow
- Colligative properties of soln. 1. Calculate the boiling point and freezing point of 30 g sucrose (342) in 110 g water? 2. A 1.5 g sample was dissolved in 30 g water. The crystals were observed to start to form in this soln at -0.93 oC. Calc the MM of the compound. 3. The osmotic pressure of a soln containing 50 g of myoglobin in benzene in 10 mL of soln is 4.8 Torr at 5oC.What is the MM of myoglobin? 4. If 100 g of glycerine (92 g/mole) is mixed with 150 mL water , what is the v. pres of soln at 25 oC? (PH2O at 25 oC = 23.76 mm Hg). Consider the two molecules shown here. 1-butanol (1)- 7.3g/100ml and butyric acid (2)- miscible The solubilities of each in water is given. What is “solubility”? What does the solubility value given for (1) here mean? Please explain, based on their structures, why the solubility of (2) is greater than the solubility of (1) in water. For a complete answer, you should start with the types of IMFs involved in the different parts of the dissolving process. You should also use the kind of reasoning from class regarding the contributions…You are in the quest to extract a drug from a known plant with medicinal properties. The structure of the compound is shown below: OH H2 CH H3C *CH3 ÓH Which solvent will best dissolve the compound? Given solvents: .CH3 HC H2 .C. H. HC CH H3C HO. H3C CH3 d b a.
- A solution of Na,SO, in water is saturated at 50°C. When a saturated solution of Na,SO, is cooled, crystals of Na,SO4-10H2O separate from the solution Temperature, °C Solubility of Na,SO, g/100g water 49 50 46.7 10 9 If 1000 kg of this solution is cooled to 10°C, the percentage yield obtained is nearly а. 91 b. 90 с. 100 d. 80Compute for the needed values for slution preparation: 1. Prepare the following solution quantitatively using boiled distilled water per group:250.0 mL 0.0500 M standard HCl solution from 1.0 M HCl 2. a. 500.0 mL 0.1000 M stock EDTA solutionb. 100.0 mL 0.0500 M stock Ca2+ solutionFNDM 21-22-Data Handling Task document - Student copy-1 _BA CB B. If the total amount of a surfactants to be used in an emulsion is 5 g, calculate the amount of Span 80 (HLB= 4.3) and Tween 20 (HLB= 16.7) needed in order to obtain an HLB value of 10.5.
- Explain the difference in the solubility of benzoic acid and sodium benzoate in water. Which of the two would you predict to be more soluble in CHCI:? Explain.a. Which is more soluble potassium nitrate or ammonia? b. What is the solubility of potassium chloride when in 70ᵒC water? c. How much ammonium chloride can dissolve in 350g of water at 20oC?The following questions all are based on the data in this table: Substance Solvent Temp.,oC Solubility, g per 100 mL X heptane 20 23.5 X heptane 80 27.0 X 1-propanol 20 0.6 X 1-propanol 80 8.7 Y heptane 20 4.0 Y heptane 80 4.0 Y 1-propanol 20 22.0 Y 1-propanol 80 31.0…