TABLE 22.1 Standard Solutions for FeNCS2+ Ion Beer-Lambert Plot Solution 1 2 3 4 5 6 mL of 2.00×10¹ M Fe(NO3)3 -1 in 0.10 M HNO3 10.00 10.00 10.00 10.00 10.00 10.00 mL of 2.00 × 10-3 M NaSCN in 0.10 M HNO3 0.00 1.00 2.00 3.00 4.00 5.00 Total volume (mL) 50.00 50.00 50.00 50.00 50.00 50.00
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Using the table provided what would be the Equilibrium [FeNCS2+],M of each?
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- 1. A 0.3056 g sample of soluble chloride was analyzed gravimetrically and 0.7265 g of AgCl was obtained. Calculate the Cl content of the sample, expressing each in % w/w. 2.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 wordsA. Calculations to construct the standard curve 1. Molar concentration of Fe(NO3)3 (from the label). 2. Molar concentration of NaSCN (from the label) 0.200M 0.00100M Standard Solutions Blank 1 3. Volume of NaSCN (mL) 0.00 1.0 2 3 4 2.0 3.0 4.0 4. Moles of SCN 0.00 5. [SCN] (25.00 mL) 0.00 6. [FeNCS²+] 0.00 7. Absorbance, A 0.00 100 10.0 0.148 0.251 10.0 10.0 0.423 0.548
- Explain why ionic attractions are weaker in media with high dielectric constants, e. g.,water and aqueous buffers.Tiame tests, the yello w colour oT sodium lons can mask the coIour of otner lons. Explain why blue glass is used to ldentity ions in the presence of sodium. Saved Normal B|I|U fx | | D E li Delete columnwhy does a change in pressure not affect the colour of a equlibruim mixture
- The Fe content in a water sample from a well was determined by subjecting an aliquot of 25.00ml of sample to treatment with HNO3, excess SCN- and finally a dilution of the treated solution to 50.00mL with distilled water. A 10.00ml aliquot of a 5.97 x 10-4M Fe3 + solution was treated in the same way. It was observed that the color of both solutions was the same when the optical path of the standard solution was 3.04cm and that of the well water sample was 2.61cm. Determine the ppm of Fe in the well water sample.Assay of sodium nitrite is an example of assay under? Cerimetry Iodometry Permanganometry Iodimetry Brominimetry14. A 130.00 mL solution of 0.00335 M A3B4 is added to a 160.00 mL solution of 0.00105 M C3D4. What is pQsp for A3D4?
- Consider One Particular Issue in Our Society (for instance: industry, etc.,) and Describe and discuss the issue you have selected with detailed examples the positive contributions of chemistry played to modern þociety. MAY étv 24 & 4 5 7 8 69 E T Y U P D F J K C V Z.Calculate the molar solubility of calcium oxalate in a solution that has been buffered so that its pH is constant and equal to 4.00. Data: Kps of CaC2O4 = 1.7x10 -9 ; Ka1 of H2C2O4 = 5.60x10-2 and Ka2 = 5.42x10-5 . Use systematic treatment.The un-ionized form of the weak acid HA does not absorb in the visible region. When it ionizes, its conjugate base (A-) absorbs light strongly at 510 nm. The following data were obtained by measuring the absorbance at 510 nm of solutions with a concen- tration of 1.0 x 104 M HA in different pH buffers. pH Absorbance 2.0 0.00 3.0 0.00 4.0 0.00 5.0 0.025 6.0 0.180 7.0 0.480 8.0 0.570 9.0 0.595 10.0 0.595 11.0 0.595 12.0 0.595 What is the approximate pK of HA?