Consider the titration of a 20.0mL sample of 0.105M HC2H3O2 with 0.125M NaOH. Determine each of the following. a) Initial pH b) the volume of added base required to reach the equivelence point c) the pH at 5.0 mL of added base d) the pH at one-half of the equivelence point e) the pH at the equivelence point f) ph after adding 5.0ml of base beyond the equivalence point
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Add up the total grams of organic material extracted via 3 extractions and compare it to the grams extracted with only 1 extraction. What conclusions can you make about the use of multiple extractions?
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The ΔGo of a reaction: (more than one answer may be correct)
| A) | will change if the temperature of the reaction is changed. |
| B) | can predict whether a reaction will be thermodynamically favorable under standard conditions. |
| C) | will change if the concentration of reactants and products are changed. |
| D) | can be used to help calculate whether a reaction is thermodynamically favorable under defined non-standard conditions. |
|
E) is not related to the equilibrium constant. |
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what does the enzyme phosphatase do in regards to nucleic acid biochemistry
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3. How many mL of 4.25 M HI will be needed to Neutralize 187 mL of 4.57 M Mg(OH)2
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Describe the following 3 types of chromatography: thin-layer chromatography, flash column chromatography, and gas chromatography. For each type describe the scale (how much compound can be used), the utility and describe the 2 phases that correspond with that type of chromatography.
2. what is necessary for separation using chromatography
3. what is normal phase and reverse phase chromatography
if you could link me a video so i could learn I will add points.
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C3H8 + 5O2 ---> 3CO2 + 4H2O
How many grams of carbon dioxide are produced from the reaction of 100.0g of propane? How many molecules of carbon dioxide are produced?
Cl2O7 + H2O ---> 2HClO4
How many grams of water are needed to react completely with 77.6 g of dichlorine heptaoxide? How many molecules of water are needed?
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The molar solubility of PbCl2 in 0.20 M Pb(NO3)2 solution
is:
(a) 1.7 x 10-4 M
(b) 9.2 x 10-3 M
(c) 1.7 x 10-5 M
(d) 4.6 x 10-3 M
(e) 8.5 x 10-5 M
Please show all work
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Use tabulated half-cell potentials to calculate ?G?rxn for each of the following reactions at 25 ?C.
Part A 2Fe3+(aq)+3Sn(s)?2Fe(s)+3Sn2+(aq)
Part B O2(g)+2H2O(l)+2Cu(s)?4OH?(aq)+2Cu2+(aq)
Part C Br2(l)+2I?(aq)?2Br?(aq)+I2(s)
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Will Magnesium spontaneously reduce Copper ion (Cu+2) to Copper (Cu)? Explain. What is the Edegree?
Mg(s) + Cu+2(aq)---> Cu(s) + Mg+2(aq)
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Explain why vacuum pumps are used with rotary evaporators. What is the advantage of using a vacuum pump with a rotary evaporator?
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1 A buffer is prepared by mixing 50.0 mL of 0.100 M acetic acid with 30.0 mL of 0.100 M sodium hydroxide and 20.0 mL of distilled water. Estimate the concentration of acetic acid in the resulting buffer. Report your answer in moles/liter, but do not include units with your answer. 2 Determine the concentration of acetate ions in the buffer solution. Report your answer in moles per liter, but do not include units in your answer. 3 Estimate the pH of the buffer solution using the Henderson-Hasselbalch equation. 4 Using the Henderson-Hasselbalch equation, estimate the pH of the buffer if an additional 10.0 mL of 0.100 M sodium hydroxide is added. 5 Estimate the pH of the original buffer if 10.0 mL of 0.100 M hydrochloric acid is added.
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