A pain reliever is soluble in cold water to the extent of 1.0g/1310 mL and soluble in diethylether to the extent of 1.0/90 mL. What is the approximate distribution coefficient?
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A pain reliever is soluble in cold water to the extent of 1.0g/1310 mL and soluble in diethylether to the extent of 1.0/90 mL. What is the approximate distribution coefficient?
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- If 0.454g of thyroxine is dissolved in 10g of benzene, the freezing point of the solution could be measured as 5.144 C. Pure benzene freezes at 5.444C and has a value for the molal freezing point depression constant of Kf of 5.12C/m. What is the approximate molar mass of thyroxine?The density of an aqueous solution increases as solutes such as salts are added. What bearing might this have on predicting whether the aqueous solution will be on the top or on the bottom for an extraction?If a student used the molar mass of magnesium to calculate the concentration in parts per million (ppm) of a manganese stock standard solution, would the reported weight percent of manganese in a subsequent unknown, that was compared colorimetrically, be higher, lower, or not change?
- The distribution constant for solute Z. between Water is 3.7. Calculate the remaining consentration of 2. remaining in a solution when 0.036 M and 31 ml. aparous solution of A is extracted with 4 portions of 8 ml. hexane AY 7.28 x 10M B ) 7.37 x 10M C) 148 x 10M D) 2.61 x 10M E ) 1.87 x 10M45. 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/°CWhy is salt not soluble in isopropyl alcohol?
- (A) if both sentences are true,(B) if both sentences are false,(C) if the first sentence is true but the second is false, and(D) if the first sentence is false but the second is true. 1. In the Winkler Titration Method, sodium thiosulfate is standardized against a known concentration of magnesium iodate. The normality (N) of a solution is always equal to its molarity (M). 2. In the experiment on determining the dissolved oxygen concentration of a water sample, the compound used to acidify the sample was hydrochloric acid. An acidic solution will have a pH greater than 7. 3. Radioactive wastes, like uranium, must be handled and disposed of according to special regulations designed to protect people and the environment. Nuclear power plants produce too much greenhouse gases due to the burning of uranium.2. An organic compound has a solubility of 2 grams/100 mL at 0 °C and 6 grams/100 mL at the boiling point of cyclohexane. Three grams of the compound is recrystallized at the boiling of cylcohexane and then cooled in an ice bath. What is the maximum recovery of the solid compound?Which of the ff. statements best describes a colloidal suspension? It consists of solid particles with 0.1 mm diameter. It consists of solid particles with at most 0.1 mm diameter. It consists of solid particles with more than 0.1 mm diameter.
- The volume of water needed to dissolve 0.0639 grams of calcium hydroxide is L.Assume no volume change upon addition of the solid.If 50.0 mL of Thiosulfate solution are required to titrate the 12 liberated from an excess of Kl by 0.3000 grams of potassium lodate, calculate (a) normality of the thiosulfate solution (b) value of each milliliter of Thiosulfate solution in terms of grams of 12.A 0.3005g sample containing Na2CO3 and NaOH requires 11.5 mL of 0.1055 M HCl to reach the phenolphthalein end point. Methyl orange is then added and 7.9 mL more of 0.1055 M HCl is required to reach the end point. Calculate the % composition of Na2CO3 and NaOH in the sample. a. 5.15% NaOH and 29.55% Na2CO3 b. 5.05% NaOH and 29.55% Na2CO3 c. 5.15% NaOH and 29.40% Na2CO3 d. 5.05% NaOH and 29.40% Na2CO3