3.(12pts) What is the ratio of NH4+/NH3 for a 0.5M solution of NH4Cl at pH 9? (The pKa of NH4+ is 10.5)
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- 1:56 .ll 0.02 KB/S 55 4.pdf CHEM 3141: BioChemistry Quiz no.4 - The double-stranded DNA sequence for a bacteria is shown below and it's coding for a hypothetical protein. The strand on top reads 5' to 3' left to right, while the strand on the bottom reads 5' to 3' right to left. The nucleotides are numbered 1 to 100. REMINDER: For this problem, transcription begins with and includes the red and underlined C/G (top strand/bottom strand) base pair and RNA polymerase proceeds from left to right along the DNA. 1. 20 40 5-СТСТСССТСТААТАТТСТGAGAТСТТАТАТСССССССТСААСАССАТСАА-3. ------+----------+ 3'-САСAGGCAGATTATAACACTCТАСААТАТАGGGCGGCAGTTCTGGТАСТT-5* 60 80 100 5'-ACAGGATAATCGCCTGCTGGGGCAAAGGCGGTGAAGGTAAAGGTGTTGCC-3' -------+ 3'-TGTCCTATTAGCGGACGACCCCGTTTCCGCCACTTCCATTTCCACAACGG-5' 1. What are the nucleotides of the resulting mRNA? Indicate the 5' and 3' ends of the mRNA. 2. What are the amino acids translated from the resulting mRNA? 3. Do the underlined nucleotides TAA (indicated in blue)…pH of solution 14.00 12.00 10.00 8.00 6.00 First 4.00 equivalence point 2.00 0 First midpoint Second equivalence point Third midpoint pH = pKa=12.32 Third equivalence point HPO4(aq) + OH(aq) PO4(aq) + H2O(1) Second midpoint pH = pKa = 7.21 H2PO4 (aq) + OH(aq) HPO42 (aq) + H2O(1) Using the Henderson- Hasselback equation, show how to create 2L of a 0.1 M KPhos pH 7.5 buffer using K2HPO4 and KH2PO4. The chart to the left should help you understand what pKa to start with. Show your work. pH = pKa = 2.16 H3PO4(aq) + OH(aq) H2PO4(aq) + H2O(l) 25.0 50.0 75.0 100.0 Volume of NaOH added (mL)Benzalkonium chloride (E=0.16) 1.5g qs 100 ml Distilled water 0.9% Nacl solution ad Make isotonic solution Questions: 1. How many ml of distilled water must be added to make the Benzalkonium chloride preparation isotonic? 2. How many ml of 0.9% NaCl must be added to make a 100ml solution?
- 8:12 O A O • O lll 63% i 1 BioChem Prob.PNG BIOCHEMISTR Calculate the pH of the following buffers containing; 2.95M HC2H302 and 1.5M NaC2H3O2 а. ka = 1.8X10-5 b. 3.0MHF and 2.5M NaF ka = 6.8X10480mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pI. The solution is then titrated with 0.2M HCL to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCL needed to reach relevant pKa value and equivalence point(s)z Relevant pKa values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.54. A doxycycline calcium syrup is preserved with 0.08% (w/v) of methylparaben, 0.02% (w/v) of propylparaben, and 0.10% (w/v) of sodium metabisulfite. Express these concentrations as ratio strengths. 54. 1:1250 w/v methylparaben 1:5000 w/v propylparaben 1:1000 w/v sodium metabisulfite
- 21 Rx KCI Sımple syrup Cherry syrup aa ad 5 mL Sig: I tsp (15 mEg) tid. x 12 days Note: molecular weight of KCI is 74.5 A How many grams of KCI is required to fill this prescription? D. How much simple syrup in milliliters is required to prepare this prescription? (assume KCI occupies no volume) 9.5Quinine ( C20 H24 N2 O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug. For quinine, pK, = 5.1 and pK, = 9.7 ( pKp = – log Kp). Only 1 g quinine will dissolve in 1920.0 mL of solution. Calculate the pH of a saturated aqueous solution of quinine. Consider only the reaction | Q+ H2O= QH+ + OH- described by pK, where Q = quinine. pH =Calculate the concentration of Y4-ion in 0.0100 M EDTA solution at pH 6. α4 = 2.2 x 10-5 for pH 6.
- 80mL of a 0.3M solution of hexapeptide Leu-His-Cys-Glu-Asn-Arg is adjusted to pH=pl. The solution is then titrated with 0.2M HCI to a final pH of 2.1. Sketch the titration curve, labelling the pH and volume axes. Indicate the volume of HCl needed to reach each relevant pKa value and equivalence point(s). Relevant pka values are: 2.1, 4.3, 6.0, 8.3, 9.8, and 12.5.9026238page=9 La-donya 021 Exam Containers Undergraduate Exam Only Containers | S1, 2020/21 EXAM CHEM0901 | S1 2020/21 mistry) ISTRY A If the enthalpy of standard formation enthalpies of CO and CO, are -110 kJ mol and -393.5 kJ mol, respectively, what is the enthalpy change for the reaction? co+1/20 CO. (e) Select one O a 283.5 kJ mo Ob-283.5 kJ mol O C -503.5 kJ mol Od 141 8 k mol 223 pm 10/12/2020 A ENG irsert prt sc delete home 6 8 Y enter H. K pause ctrl alt59. An assay for ergocalciferol calls for the dissolution of 0.5 mg of ergocalciferol with chloroform up to 5 mL, and the ad- dition of 0.3 mL of acetic anhydride and 0.2 mL of sulfuric acid. Calculate the ratio strength of ergocalciferol in the mixture. 59. 1:11,000 w/v ergocalciferol
