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If you added the oxidizing agent, chromate, to a solution of phenol, would the phenol be oxidized and would a green Cr3+ solution be formed
You diluted the 1:2 dilution 1:3 and finally got a reading that fit onto your standard curve. Your absorbance was 0.450. The best fit line equation : y=0.3413x. What is the actual concentration your
Bovine Serum Albunim (BSA) You need to make 100 ml of 2mg/ml BSA. Describe how you would dilute the stock solution to make this
We would like to make a buffer solution with a target pH of 8.44 (ignore activity). Suggest 3 conjugate acid/base pairs that could be used to make such a buffer.
Calculate the wavelength of the light in nanometers corresponding to this transition. You can use the following values for your calculations: Planck's constant (h) = 6.626x10^-34 Jxs, speed of light
(R)-(3-Chloro-2-methylpropyl) methyl ether (A) on reaction with azide ion (N3-) in aqueous ethanol gives (S)-(3-azido-2-methylpropyl) methyl ether (B). Compound A has the structure ClCH2CH(CH3)CH2OC
(Neglect volume changes.) [PO43-] = M. (b) Which cation precipitates first? Ag+ Cu2+ (c) What is the concentration of PO43- when the second cation begins to precipitate? [PO43-] = M.
What is the pH of a buffer prepared by adding 0.809mol of the weak acid HA to 0.305mol of NaA in 2.00L of solution
Balance the following equation by the half-reaction method for the pH conditions specified: H2CO (aq) + Ag(NH3)2+ (aq) ? HCO3- (aq) + Ag (s) + NH3 (aq) (basic)
A- What is the pH of a buffer prepared by adding 0.809mol of the weak acid HA to 0.305mol of NaA in 2.00L of solution? The dissociation constant Ka of HA is 5.66 X 10^-7 B- What is the pH after 0.15
Construct a rough plot of pH versus volume of added base for the titration of 50 mL of 0.050 M HCN with 0.075 M NaOH. Ka = 4.0*10^-10 for HCN (a) What is the pH before any NaOH is added? pH = 5.36 (
Calcium carbonate is relatively insoluble and the dissolution reaction is endothermic: CaCO3 ---> Ca2+ CO3^-2
The first-order reaction 2N2O(g) --> 2N2(g) + O2(g), what is the concentration of N20 after 3 half-lives if 0.25 mol of N2O is initially placed into a 1.00-L reaction vessel
A reaction has a standard free-energy change of -14.40 kJ mol-1 (-3.442 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
Calculate the pH at equivalence point when 40.0 ml of 0.50 M aniline is titrated with 30.0 ml of 0.67 M HBr. For aniline Kb=3.8x10exp-10
Steam is condensed at 100 °C and the water is cooled to 0 °C and frozen to ice. What is the molar entropy change of the water
Your intuition probably tells you that for 2 identical blocks, Tf is the average of the initial temperatures, so that Tf = 1/2 (T1 + T2)
The isothermal reversible expansion at room temperature of one mole of an ideal gas from 2L to 3L. (Answer: 3.4 J/K) b. One mole of ice at 265K is melted under usual lab conditions to form water at
Fundamentally, why would any line in the hydrogen spectrum between 250 nm and 700 nm belong to the balmer series. How much energy in kj per mole does it take to ionize an H atom
The intiala rates at various substrate concentrations for an enzyme-catalyzed reaction are as follows.
A certain second-order reaction (B-product) has a rate constant of 1.25×10?3M^-1s^-1 at 27 degree celcius and an initial half-life of 264s . What is the concentration of the reactant B after o
Provide structures of the substrate, initial additional product, and the product formed after hydrolysis in the reaction of cyclohexanone with sodium acetylide
The following data was obtained on the rate of hydrolysis of 17% sucrose in 0.099 M HCl aqueous solutions at 35 C. What is the order of the reaction with respect to sucrose and the value of the rate c
What other substance(s) found in chocolate bear(s) a strong structural resemblance to caffeine? Draw the structures of these substances and point out the similarities.
How many mL of 0.450 M NaOH are needed to titrate 25.0 mL solution of 0.250 M FeCl3 solution? FeCl3 aq + 3NaOH arrow to Fe(OH)3 aq +3NaCl aq