All are properties of ideal solvent for recrystallization except: Has a boiling point below the sample's melting point Does not react with the target compound Immiscible with the impurity Dissolves the sample when hot Previous
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- Typical adsorption indicator that is useful for the titration of chloride ion with silver nitrate. Fluorescein b. Iodine c. Sodium Thiosulfate d. NaClAssuming your brass sample is 100 percent copper by mass, calculate the minimum volume of concentrated (15.8 M) HNO3 needed to dissolve the sample. Please show workTo calculate the unknown concentration of a chemical in a solid sample, 4 different calibrationcurves were plot using 4 different methods. Which of the following method is considered asacceptable? a. Method 4, R? = 0.998b. Method 1, R2 = 0.650c. Method 2. R' = 0.890d. Method 3, R' = 0.169
- TRUE OR FALSE 1. Sodium arsenite is formed due to the solubility property of arsenic trioxide in sodium hydroxide. 2. The permanganate method is always carried out in a highly acidic medium. 3. The color of permanganate solution renders impossible accurate readings at the lower meniscus. 4. Sodium bicarbonate in the standardization of iodine solution acts as a buffer. 5. Sulfuric acid in permanganate titration prevents the formation of reduction products.A fermenter was filled with 10L of 0.6 mol/L sodium sulfite solution containing 0.003M Cu2+ ion and the air sparger was turned on. After exactly 10 minutes, the airflow was stopped and a 5 mL sample was taken and titrated. The concentration of sodium sulfite in the sample was found to be 0.2 M. Calculate the oxygen uptakesuppose your absent minded lab partner grabbed medium porosity filter paper instead of the fine porosity paper and you noticed cloudiness in your filtrate. will the reported concentration of limiting reactant solution be greater than, less than, or equal to the true concentration of limiting reactant solution? Na3PO4 and BaCl2 are the solutions used
- Why did the color of the solution in the conical flask change at the end of the titration?11 In an acid-base neutralization reaction 23.74 mL of 0.400 M sodiumhydroxide reacts with 50.00 mL of sulfuric acid solution. What is the concentration of theH2SO4 solution? A) 0.0950 MB) 0.190 MC) 0.380 MD) 0.760 MAccurately weigh out about 6g copper(ii) sulfate crystals into a weighing boat. Use the copper(ii) sulfate crystals to make up 250cm3 of standardized copper (ii) sulfate solution Pipette 25cm3 of this solution into a conical flask Add 1.5g potassium iodide and swirl thoroughly Titrate this solution with standard 0.1 moldm-3 Na2S2O3 in a burette. When the iodine color fades, add 1 cm3 starch indicator. Use your titration data below to calculate the percentage by mass of copper in the copper(ii) sulfate crystals.
- The test tube used in the determination of the ΔHrxn for nitric acid was still wet with water. [ magnitude of ΔHrxn] Please explain why the reaction decreases. Maximum of 3 sentences only.What technique might be used to analyze an aliquot from a reaction mixture? Gas Chromatography Titration Gravimetric Analysis All of the aboveVolumetric Analysis The mass of KHC8H4O4 is measured to the nearest milligram; however, the volume of water in which it is dissolved is never of concern—water is even added to the wall of the Erlenmeyer flask during the titration. Explain why water added to the KHC8H4O4 has no effect on the data, whereas water added to the NaOH solution, may drastically affect the data.