During the mixing step, briefly discuss why gentle mixing of the solution is necessary after the addition of ferric chloride? How does this impact the next step of sedimentation?
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- During the mixing step, briefly discuss why gentle mixing of the solution is necessary after the addition of ferric chloride? How does this impact the next step of sedimentation?
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- When dissolving salt in water, what would be the effect on the dissolution rate if a 1, 0g chunk were dissolved instead of 1.0 g of crushed salt?Volumetric 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.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.
- Why are many ionic precipitates washed with electrolyte solution instead of pure water?What are the applications of re-crystallization in gravimetric analysis? answer at your own words and answer should be to the point, not any irrelevant wordsExplain how preconcentration of cations with an ion exchanger works. Why must the concentrated acid eluent be very pure?
- Why is rinsing of the burettes both with distilled water and solution a critical step in titration?Why homogenously formed precipitates are better suited for analysis than a precipitate formed by direct addition of a precipitating agent?what are the methods to know in the gravimetric analysis technique?
- Assuming 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 separate three organic compounds from an aqueous solution, one basic, one acidic and one neutral apolar, by extraction technique, create an appropriate extraction scheme by writing examples for each and write down the reactions that took place at each stage.Accurately 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.