CAN YOU PLEASE EXPLAIN HOW TO DETERMINE METHOD I SHOULD USE TO FIND THE PH IN SUCH PROBLEMS. WHAT RULES SHOULD I FOLLOW OR THINK OF TO DETERMINE SUCH QUESTIONS. (STRONG ACID, STRONG BASE, BUFFER 1, BUFFER 2, WEAK ACID, WEAK BASE ETC)
PLEASE: dont solve if you dont explain briefly, and explain to me how I can determine it by myself.
The acid H2A has Ka1 = 2.00 ∙ 10-5 and Ka2 = 5.00 ∙ 10-9. We have a buffer consisting of 0.0300 moles of HA– and 0.0100 moles of A2– and adds 0.0500 moles of H3O +. What kind of system do we have and how to calculate the pH? Buffer 1 = H2A / HA– Buffer 2 = HA– / A2–
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| Be sure to answer all parts. How many photons at 586 nm must be absorbed to melt 4.65 ×102 g of ice? (It takes 334 J to melt 1 g of ice at 0°C.) (Enter your answer in scientific notation.) |
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Be sure to answer all parts. .........× 10^...... ( photons/J Enter your answer in scientific notation.) Determine the binding energy (in eV) of a metal if the kinetic energy possessed by an ejected electron (using one of the photons with wavelength 460 nm) is 2.58 ×10−19 J. .............. eV |
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discuss at least 2 best practices in pharmaceutical distribution. Illustrate why by providing examples, these are considered best practices. Discuss the ramifications of violation of the best practices you chose. Tie the best practices to cGMP practice. Do you feel that best practice mirrors or expands upon cGMP? How is that the case, and why do you feel this is so. Please discuss what you learned from this article. Your essay should be a minimum of 250 words, with sources cited.
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A chemistry graduate student is given 250.mL of a 0.10M chlorous acid HClO2 solution. Chlorous acid is a weak acid with Ka=1.1x10^−2.
What mass of NaClO2 should the student dissolve in the HClO2 solution to turn it into a buffer with pH =2.40?
You may assume that the volume of the solution doesn't change when the NaClO2 is dissolved in it.
Be sue your answer has a unit symbol, and round it to 2 significant digits.
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List three changes you would expect in the IR spectrum of 2,3-dibromocinnamic acid as compared to the IR spectrum of trans-cinnamic acid. Make sure to reference the approximate wavenumber of any relevant peaks and whether they correspond to a stretch or a bend.
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IR and Ramen spectra of crystalline barium rhodizonate have been reported. from an inspection of the data. it was concluded that the rhodizonate ion, C6O62-probably had D6hsymmetry. the other possible structure can be deduced the rhodizonic acid molecule. In the D6h ion there is no C=C compared to the C2hequivalent. Compare two anions and determine which anion fits the data shown below.
235 (IR) 1051 (IR) 280 (Ramen) 346 (Ramen) 436 (Ramen) 553 (Ramen) 1449 (IR) 386 (IR) 1546 (Ramen) 1252 (Ramen) 1669 (Ramen)
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Be sure to answer all parts. In acidic solution, O3 and Mn2+ ions react spontaneously: O3(g) + Mn2+(aq) + H2O(l) → O2(g) + MnO2(s) + 2H+(aq) E o cell = 0.84 V
Write the balanced half-reactions and calculate E o manganese when given E o ozone = 2.07 V.
Include states of matter in your answers.
Reduction half-reaction:
Oxidation half-reaction:
E o manganese=
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What alcohol should be used in the purification of ester Isopentyl propanoate (aka isoamyl propionate). And what mechanism does the reaction follow?
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What is the exact procedure for MOLYBDENUM BLUE METHOD using Spectrophotometer to determin phosphorus concenrration.. Pleas provide with details how to make standard and blank solutions.
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cholesterol is the major bio-molecule that causes heart attack; this molecule is classified as a steroid. the molecule contains a double bond where is this located?
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how would a drug that is soluble in the blood affect hemoglobin?
biochem
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The following questions relate to the acid-base neutralization of HCl and NaOH
HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l)
a. A 25.00 mL sample of HCl is titrated with 0.1045 M NaOH using phenolphthalein as an indicator. The buret containing NaOH initially reads 0.30 mL and reads 48.29 mL at the end point. Determine the concentration of the HCl solution in mol/L. Show ALL work.
b. If 50.0 mL of 0.500 M HCl at 25.0°C is added to 50.0 mL of 0.500 M NaOH at 25.0°C in a coffee cup calorimeter, the temperature of the mixture rises to 28.2°C. What is the heat of reaction per mole of acid? (Assume the mixture has a specific heat capacity of 4.18 J/(g·K) and that the densities of the reactant solutions are both 1.00 g/mL). Show ALL work.
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Hydrogen gas reacts with nitrogen gas to form ammonia according to the reaction below.
H2 (g) + N2 (g) → NH3 (g)
a. How many moles of NH3 are produced for every 1 mole of H2? Classify this reaction.
b. Suppose 12.2 g of H2 (g) reacts with 48.4 g of N2 (g). Identify the limiting reactant. What is the theoretical yield of the ammonia product in grams ? Show your work.
c. What mass (in grams) of the excess reagent is left over? Show your work.
d. If 55.0 g of ammonia is produced, what is the percent yield? Show your work.
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