Sample "Lodi" was subjected to different chemical tests and the following data were obtained: Test Ninhydrin Biuret heating +/- Observations colordess spot appearance of violet -colored solution formation of coagulated product + + From the choices below, what is the most possible identity of sample "Lodi"? (A amino acid (B) amine © peptide D protein
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- After digesting a 2.6824g stake sample the nitrogen is oxidized to NH4; converted to NH3 with NaOH and distilled in a collection flask containg 50.0ml of 0.7867 M HCl.The excess HCL is then back titrated with 0.8094 M NaOH and required 20.24 ml to reach bromothymol blue end point. Report the percentage w/w protein in the steak given that there is 3.39g of protein for every gram of nitrogen in the steakA protein of molecular weight = 55,000 g/mol and at 1 mg/mL concentration was titrated with Ellman’s reagent. What is the molar concentration of the protein in solution?A 1.5000-g sample of cereals was analyzed for nitrogen using the Kjeldahl procedure. The receiving flask contained 69 mL of 0.02 M HCl. After the ammonia was collected, the solution was titrated with 0 M NaOH, requiring 11.72 mL to reach the methyl red endpoint. Calculate and percent protein in the sample (f=5.70). Ans. in 3 SFs
- The peptide below is placed into a buffer with a pH = 1.54 OH -NH-CH-C -NH—CH— с—ОН -NH-CH-C H;N-CH- CH2 -NH -CH-C ČH2 CH2 ČH3 CH2 C: :O NH2 CH2 OH H2G NH3 What direction will the peptide move? If it will move towards the positive electrode give your answer as 1 If it will move towards the negative electrode give your answer as -: If it will not move give your answer as 0M 23 (H) Inorganic Analytical Chemistry pard My courses CHEM 23 (H) FS-AY:20-21 Week 4-5: Quantitative Analysis by Gravimetry and Titration Quiz 4 Qu 10 The 500.0-mg sample of impure Na2 CO3 (FM: 105.96) required 22.00 mL of the HCI standard solution (the obtained concentration of HCI from the previous question, problem 5: Titrimetry short answer type) for complete neutralization. ut of 1. Give the balanced chemical equation between the sample, Na2CO3 and the standard, HCI. 2. What is the mass (g) of Na, CO3 in the sample? 3. Calculate the % (w/w) purity of a 500.0-mg sample of impure Na2 CO3 Note: Type your solution here or upload its pic in Jpeg or pdf format. Another option is to send it to me via email (subject: Fam name-Quiz 4) or messenger, privately. Do not forget to box the final answer and write your name. В I 1.2) Will Acanthite grow or dissolve if [Ag*(aq)]=10-6 M, pH=6, and [H₂S (aq)]=10-³m? (5 pts) Ag₂S (s) + 2 H+ (aq) ↔ 2Ag* (aq) + H₂S (g)
- Chemistry H,N. CH, H,N. HO, но Phenylalanine (1) Tyrosine (2) H,C HN CH, H,C `CH, H,C но Triethylamine (4) N-acetyl-OMe-Tyrosine (3) All four compounds are dissolved in ethyl acetate. If you started by extracting the solution with 1 M HCI, which of the following compounds would end up in the aqueous layer? 4 12 Instead, you decide to start by extracting the ethyl acetate solution with 5% NaHCO3 (sodium bicarbonate). What will remain in the organic layer? 1 2 4(b) Using appropriate chemical reactions for illustration, show how calcium present as the dissolved HCO3- salt in water is easier to remove than other forms of hardness, such as dissolved CaCl2. (c) A water has the following analysis: mg/l mg/l Na+ - 20 Cl- - 40 K+ - 30 HCO3- - 67 Ca2+ - 5 CO32- - 0 Mg2+ - 10 SO42- - 5 Sr2+ -2 NO3- - 10 What is the total hardness, carbonate hardness and noncarbonated hardness in mg/l as CaCO3.For Qualitative analysis of amines and amine Unknown, provide chemical structures.
- Vernon was asked to isolate a storage protein from Saba banana (Musa balbisiana Colla). According to the protocol given by his laboratory instructor, the storage protein must be stored in a 0.750 M citric acid buffer solution pH 6.21. Citric acid is a triprotic acid that follows a dissociation equilibrium shown below: H3CH₂O7 H₂CH₂O7 = z → Ka, = 8.32 x 10-4 Ka₂ = 1.82 x 10-5 HC₂H5O72- C₂H50,³- COMPOUND/SALT H3C6H5O7 NaH₂C6H5O7 Na₂HC6H5O7 Na3C6H5O7 Ž Ka3 = 3.98 x 10-6 Help him prepare the buffer by answering the following questions: 1. Based on the chemical equation above, which species will be the (a) acidic and (b) basic component of the buffer to be prepared? 2. Write the complete equilibrium reaction involved in the buffer system. 3. Write the pertinent chemical equations to illustrate what happens upon the addition of small amounts of (a) strong base and (b) strong acid to the buffer system. 4. Based on your answer in number 1, choose among the salts given in the table below and…Yerleştirme Görüntü Paylaş Pencere Yardım Report Fe spectro 2 %125 Ekle Tablo Grafik Metin Ortamlar Yorum Answer the following questions. 1) The 40 mg/L Fe stock solution was prepared with iron (II) ammonium sulfate hesahystoate [Fe(NH.):(SO.):(H;O)«] rather than with iron (II) chloride [FeCl:). What is the reason of this choice? 2) For convenience, several glass or quartz cells are generally used spectrophotometrie analyses; these cells should be "matched" with regard to their.optical properties. a) Why they should match with each other? b) Suppose one of the cells has a light path that is slightly longer than the usual 1.00 cm. How would this affect the results of an analysis if the defect was not recognized? c) Explain how the "unmatched' cell problem can be solved? 3) Draw the scheme of single bcam spectrophotometer and state the function of each compartment sepcrately.An unknown sample containing mixed alkali (NAOH, NaHCO3, or NazCO3) was analyzed using the double flask method. A 250 mg sample was dissolved in 250 mL CO, free water. A 20.0 mL aliquot of this sample required 11.3 mL of 0.009125 M HCI solution to reach the phenolphthalein end point. Another 29.0 mL aliquot of the sample was titrated to the bromocresol green endpoint using 311 mL of the standard acid. What is/are the component/s of the sample? O Cannot be determined O NAHCO3 only O NAOH and Na,CO3 O NazCO3 only O NAHCO, and Na2CO3