QUESTION 2 How do we obtain k ? Dividing the Absorbance by the concentration, it

Question

QUESTION 2 How do we obtain k ? Dividing the Absorbance by the concentration, it is the quotient. Dividing the Absorbance by the wavelength, it is the quotient. O Plotting absorbance vs concentration, it is the slope O Plotting absorbance versus volume, it is the slope None of the above QUESTION 3 In Lambert-Beer equation, A-kAc A is in nanometers, k? is in M-1 and c is in moles/liter. 0 A has no units, ? is in M-1 and c is in moles/liter. 0 A is in Molar, k? has no units in Molar. Using units is never recommended. None of the above QUESTION 4 In a diluted solution water is added and the concentration increases water is added and the volume decreases O water is added and the concentration decreases. O water is added and the number of moles decreases None of the above

Explanation / Answer

If we graph the absorbance vs concentration we get a line of the form Y = MX + B, where M is the slope of the line
The law indicates that A = k?c. If A is the absorbance and c is the concentration then the slope is k?. So the answer is: Plotting absorbance vs concentration, it is the slope

The absorbance does not have units. If the concentration is in mol / L then the dimensional analysis indicates that k? has units of M-1. So the answer is: A has no units, k? is in M-1 and c is in moles/liter

If more water (solvent) is added in any aqueous solution, the concentration of the solute will decrease. So the answer is: water is added and the concentration decreases

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---