7. You are studying a reaction involving o-nitrophenol and want to keep absorption values between 0.2 and 0.8 at 410 nm. What are the lower and upper concentration limits permitted? Concentration (M) · Concentration (μM) Lower 3 3 Upper 3 3 8. You are provided with an NADH solution which you are told was a 150-fold dilution from a stock solution. You record the absorbance of your solution as 0.611 at 340 nm. What was the stock concentration? Stock concentration (M) 3 Stock concentration (mM) 3
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- N-H bonds in ammonia NH_3NH3 produce an IR absorbance at 3335 cm^-1. P-H bonds in phosphine PH_3PH3 produce an IR absorbance at 2327 ccm−1. Explain the difference in a single sentenceBe sure to answer all parts. Covalent bonds in a molecule abso rb radiation in the IR region and vibrate at characteristic frequencies. (a) A molecular vibration absorbs radiation of wavelength 176 µm. What frequency (in s) corresponds to that wavelength? Enter your answer in scientific notatio n. X 10 -1 (b) A molecular vibration has a frequency of vibration of 6.753 x 10 m) corresponds to that frequency? 13 Hz. What wavelength (in p IIO $4 %23 2 4 3. 7. e p4b please answer (predict the outcome and explain briefly
- The commercial production of nitric acid involves thefollowing chemical reactions:4 NH31g2 + 5 O21g2¡4 NO1g2 + 6 H2O1g22 NO1g2 + O21g2¡2 NO21g23 NO21g2 + H2O1l2¡2 HNO31aq2 + NO1g2 (a) Predict what kind of reaction dopamine is most likely toundergo in water: redox, acid-base, precipitation, or metathesis?Explain your reasoning. (b) Patients with Parkinson’sdisease suffer from a shortage of dopamine and may need totake it to reduce symptoms. An IV (intravenous fluid) bag isfilled with a solution that contains 400.0 mg dopamine per250.0 mL of solution. What is the concentration of dopaminein the IV bag in units of molarity? (c) Experiments withrats show that if rats are dosed with 3.0 mg/kg of cocaine(that is, 3.0 mg cocaine per kg of animal mass), the concentrationof dopamine in their brains increases by 0.75 mM after60 seconds. Calculate how many molecules of dopaminewould be produced in a rat (average brain volume 5.00 mm3)after 60 seconds of a 3.0 mg/kg dose of cocaine.2. ] You make 150.0 mL of a copper(II) sulfate solution but forget to cover it before leaving for the day. The next class, you measure the volume and find that you only have 132.0 mL remaining. You didn’t record the initial concentration, but you measure the absorbance of the remaining solution at 620 nm and find that it is 0.386. You also construct the following calibration curve for CuSO4: Standard solution Abs620 0.50 M 0.424 0.40 M 0.336 0.30 M 0.247 0.20 M 0.159 (refer to image) a. What is the value for k (in Beer’s Law)? Provide a calculation or graph to support your answer. b. What is the concentration of the (remaining) solution? c. What was the concentration of the original solution from the first class? d. If you removed 7.5 mL from the 132.0 mL solution in the process of measuring the absorbance, how much water should you add to obtain the original concentration that you solved for in part (c)?¿Cuál es el porcentaje en volumen cuando preparamos 25 ml de ácido nítrico en 800ml de la solución?
- (4d-202) A buffer solution is made by mixing H3PO4 and NaH2PO4 in water. How does this buffer system neutralize an addition of 5 mL of 0.45 M NaOH? Choose one of the options below. • The H3PO4, as a weak acid, will neutralize the added NaOH • The NaH2PO4, as a weak base, will neutralize the added NaOH • The H3PO4, as a weak base, will neutralize the added NaOH • The NaH2PO4, as a weak acid, will neutralize the added NaOH For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). Paragraph Arial 14px A v Ix Q x² X, g ST 田用国 EXE ABC Ť {;} +) P. O WORDS POWERED BY TINY +]5. (a) The molecule shown below can react with a base, and lose one of the five protons to form an anionic intermediate. Draw this anionic intermediate, and explain why that proton is removed instead of one of the others. CI H Cl -H H H Cl (b) The same molecule can react with Ag", and lose one of the three chlorine atoms to form a cationic intermediate. Draw this cationic intermediate, and explain why that chlorine atom is removed, while neither of the other two are removed. CI H Cl -H H H H CICarotenoids are yellow, orange, andred pigments synthesized by plants. Theobserved color of an object is not thecolor of light it absorbs but rather thecomplementary color, as described by acolor wheel such as the one shown here.On this wheel, complementary colorsare across from each other. (a) Based onthis wheel, what color is absorbed moststrongly if a plant is orange? (b) If a particular carotenoid absorbsphotons at 455 nm, what is the energy of the photon?
- Construct the expression for Kc for the following reaction. Question 8 of 35 [H0] CH,COOH(aq) + H₂O (1) CH,COO (aq) + H₂O'(aq) Drag the tiles into the numerator or denominator to form the expression. Each reaction participant must be represented by one tile. Do not combine terms. Kc = 2[H₂01 [H,0⁰ [H,01 2[H,0² 2[H,0] [CH₂COO] 2(CH,COO] (CH,COOP 2[CH,COO [CH,COOH] 2(CH,COOH] [CH,COOH!" 2[CH,COOH!" 2[H,01¹ RESET [H₂O]".Q1. To determine the concentrations (mol/L) of Co(NO3)2 (A) and Cr(NO3)3(B) in an unknown sample, the following representative absorbance data wereobtained.A (mol/L) B (mol/L) 510nm 575nm5×10−1 0 0.714 0.0970 6×10−2 0.298 0.757Unknown Unknown 0.671 0.330Measurements were made in 1.0 cm glass cells.i. Calculate the four molar absorptivities: ∈A(510), ∈A(575), ∈B(510) and ∈B(575).ii. Calculate the molarities of the two salts A and B in the unknown.Given: You mix together 3 mL of Al3+ (3.00 x 10-5 M) and 3 mL of xylenol orange (5.00 x 10-5 M). The absorbance at room temperature is 0.1 and the absorbance at 65oC is 0.35. a. What is the concentration of AlQ- at 65 degrees Celcius?