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How is Qsp affected when adding in excess reagent during a precipitation?
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- A) Why is a high super saturation value is undesirable for precipitation?suppose 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 usedHow can you decrease supersaturation during a precipitation?
- Make an schematic diagram for procedure below: B. %SO3 determination Transfer all precipitate to the filter paper avoiding any loses during the filtration procedure. One may use a rubber policeman to scrape remaining precipitate in the beaker. Wash the precipitate in the beaker 3x with hot water before transferring to the filter paper. Test the washings with 0.1 M AgNO3 Cloudiness indicates presence of chloride ions; therefore there is a need to wash more the precipitate. Carefully lift the paper out of the funnel, fold it as demonstrated by your instructor and transfer it onto the constant weighed crucible. Dry the crucible cautiously with a small flam, as instructed by your instructor. The flame should be directed at the top of the container, and the lid should be off. Avoid spattering. After drying, char the filter paper by increasing the flame temperature. The crucible should have free access to air. The lid should be kept handy to smother the filter paper in case it catches fire.…True or False Very Insoluble precipitates are not the best candidates for gravimetric analysis.Compare and contrast an anticipatory standard to a reactionary standard by listing and describing some advantages and disadvantages.
- Transfer 3-4 drops or a pinch of the test compound (Aniline) to 3 ml of the solvents, 5% NaOH and 5% HCL Shake the mixture thoroughly. The time required for the solute to dissolve in the solvent should not be more than 2 minutes. Indicate with (+) or (-) if the test compound is soluble or insoluble in the solvent. What is the solubility class of Aniline in 5% NaOH? (Very soluble, freely soluble, soluble, sparingly soluble, slightly soluble, very slighlty soluble, practically insoluble) What is the solubility class of Aniline in 5% HCL? (Very soluble, freely soluble, soluble, sparingly soluble, slightly soluble, very slighlty soluble, practically insoluble)If 500mL of 0.10M Ca2+ is mixed with 500mL of 0.10M SO42-, what mass of calcium sulfate will precipitate? Ksp for CaSO4 is 2.40 • 10-5. express answer to 3 significant figures. And include units.Solid cobalt (II) acetate is slowly added to 125 mL of 0.0945 M ammonium chromate solution. What is the concentration of cobalt required to just initiate precipitation? The Ksp of CoCrO4 is 7.1 * 10 -4. Report answer in scientific notation to two sig figs.
- Complete the following: 1. Random error, also called _________arises from the effects of uncontrolled variables in the measurement. 2. The ____________,measures how closely the data are clustered about mean. 3. The chemical equilibrium in which all the reactants and products are in the same phase are called____________. 4. Reaction that go to completion and never proceed in the reverse direction are said to be_____________ 5. The equation for buffer is the__________equation. 6. A ___________solution is one that resists changes in pH when small quantities of an acid or an alkali added to it. 7. __________is the pH of the pure, neutral and polyproticWhy is high relative supersaturation undesirable in a gravimetric precipitationDo you agree/disagree with the following statement below? State your reasons. "Classical precipitation gravimetric analysis is best used towards the end of quantitative analysis while classical volumetric analysis is best used as the first technique to quantify analytes."