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SOLVED: The concentration of caffeine in beverages is determined by a reversed-phase HPLC separation using a mobile phase of 20% acetonitrile and 80% water, and using a nonpolar C8 column. Results for a series of 10-Î¼L injections of caffeine standards are given below:Caffeine concentration (mg/L) Peak area (arbitrary units)50.0 226724100.0 453762125.0 559443250.0

SOLVED: The concentration of caffeine in beverages is determine…

2021年10月24日

(a) When you try separating an unknown mixture by reversedphase chromatography with 50 % acetonitrile/50% water, the peaks are too close together and are eluted in the range k=2-6. Should you use a higher or lower concentration of acetonitrile in the next run? (b) When you try separating an unknown mixture by normal-phase chromatography with pure 50 % hexane/50% methyl t-butyl ether, the peaks are too close together and are eluted in the range k=2-6. Should you use a higher or lower concentratio

(a) When you try separating an unknown mixture by reversedpha…

2022年4月11日

Acetonitrile

Acetonitrile

Pharma Grade Acetonitrile

Pharma Grade Acetonitrile

In a study of the conversion of methyl isonitrile to acetonitrile in the gas phase at 250 Â°C, CH3NC(g) â†’ CH3CN(g), the concentration of CH3NC was followed as a function of time. It was found that a graph of ln[CH3NC] versus time in seconds gave a straight line with a slope of -4.44Ã—10-3 s-1 and a y-intercept of -3.40. Based on this plot, the reaction is (zero/first/second) order in CH3NC and the half-life for the reaction is seconds.

In a study of the conversion of methyl isonitrile to acetonitrile in t…

2021年8月14日

HPLC Mobile Phases: Acetonitrile vs Methanol - Which One Is Better?

HPLC Mobile Phases: Acetonitrile vs Methanol - Which One Is Better?

2022年2月23日

The Surprising Science of Freezing Water Under Pressure: Exploring the Ice Water Phase Diagram | SchoolTube

The Surprising Science of Freezing Water Under Pressure: Exploring t…

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The density of acetonitrile (CH3CN) is... | Filo

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