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Explain why different results are observed when HCl and H2SO4 are added to brine?
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- PLEASE ANSWER A. A very dilute solution of CuSO4 is used in the Biuret test. Why?To which sample solution the spike will be add? the distillate>130C the mass standard the distilled <130CWhich of the following observations is INCORRECT? a. 4-aminophenol: wine red solution in FeCl3 b. Phenol: white precipitate in Br2 in water c. 3,5-dimethyl-1-hexanol: No layer formation in Lucas reagent d. 3,6-dihydroxycycloheptanone: decolorization of solution in KMnO4 test
- What are the findings of Lahdenpaa et al. (1997) in using standard-grade Avicel® PH 101?how to Distinguish AgNO3 from Ba(NO3)2 and how to distinguish NaCl from NaI if they were in a test tube without being labeledWhat is the result when these samples are mixed with 5 mL strong alkali NaOH then 1ml ethanol a. vegetable oil b. margarine c. mineral oil
- Briefly describe how you could separate the components of a mixture of benzoic acid and Na2SO4 and recover the two separated substances.Find the concentration of sodium thiosulfate in mol/L. 0.25M and the volume used was 25cm^3find the ka and kb of acetic acid at 0.2 M from the experimental pH range of 1.2-2.8 and compare your results to the actual ka of 1.85*10^-5 and the kb is 5.6*10^-10. were the results similar? explain why or why not.
- 1.Describe other melting point apparatus that are available for routine analysis. 2. Explain the differences in melting point of these test compounds by relating with their structures and intermolecular or intramolecular forces of attraction: a. benzoic acid and salicylic acid b. p-aminobenzoic acid and salicylic acid c. oxalic acid and succinic acid d. succinic acid and malic acidBriefly explain why starch TS is added near end-point during iodometric titrations.Why is it common practice to boil the solution near the equivalence point in the standardization of Na2CO3 with acid?