True or False:
If your unknown was found to be a low MW neutral compound, water would be a good solvent to use for recrystallization.
True or False: If your unknown was found to be a low MW neutral compound, water...
A compound is slightly soluble in hexanes, soluble in water, soluble in DMSO, and the compound is insoluble in benzene, and is insoluble in toluene. Based on this, the following is true. a) DMSO is a good recrystallization solvent b) water is a good recrystallization solvent c) hexanes is not a good recrystallization solvent d) hexanes is a good recrystallization solvent e) benzene is a good recrystallization solvent
Proteins are least soluble in water at their isoelectric point at low pH at neutral pH at high pH at both high and low pH QUESTION 7 The following molecule (shown below) represents a compound that can Induce platelet aggregation and vasoconstriction COOH OH True ОО False
Extraction Q1. Why doesn’t the neutral organic compound dissolve in the 1.5 M NaOH solution? Q2. Why is diethyl ether a good choice for the organic solvent in this extraction experiment? Q3. What experimental difficulty would you encounter if you neglected to include the drying step before evaporating the ether solution of the neutral organic compound? Q4. Why are the two organic compounds recrystallized before their melting points are determined? Q5. What IR bands are most useful in distinguishing a...
An unknown compound was found to be insoluble in water and insoluble in 5% NaOH. However, it dissolved quickly in 5% HCl. Which functional group is more likely to be present: an alcohol or an amino group?
The solubility of a compound is 8.4 g per 100 mL in boiling water, 1.9 g per 100 mL in cold water, whereas its solubility in ethanol is 13.8 g per 100 mL at 78 C and 4.2 g per 100 mL at 2 C. Which solvent would be better for the recrystallization of the compound? Explain.
Select True or False: Silver chloride (AgCl) has an extremely low solubility in water, therefore, it is a weak electrolyte O True O False
The best ending for a credit refusal is to encourage a cash purchase ..TRUE OR FALSE Buffers relate to the sender rather than the receiver ,,TRUE OR FALSE Emphasize I or WE when planning a neutral or good news messages ..TRUE OR FALSE
You have isolated an unknown colored compound (MW = 200,000 g/mol) with a concentration of 5 mg/mL. After you add 2 mL of your unknown to 8 mL of buffer, you obtain an absorption spectrum of your colored compound. You record an Absorbance value of 0.57 at its lambda max, 460 nm. The light path is 1 cm. Calculate the molar concentration (M) of your diluted sample. Show your work. B. Calculate the extinction coefficient (M-1cm-1) of your diluted...
You have isolated an unknown colored compound (MW = 200,000 g/mol) with a concentration of 5 mg/mL. After you add 2 mL of your unknown to 8 mL of buffer, you obtain an absorption spectrum of your colored compound. You record an Absorbance value of 0.57 at its lambda max, 460 nm. The light path is 1 cm. Calculate the molar concentration (M) of your diluted sample. Show your work. B. Calculate the extinction coefficient (M-1cm-1) of your diluted...
9. True or false: the determination of a molar mass of a compound by the titration method used today depends on having a pure sample of the unknown compound? Explain.