How many grams of salt can be dissolved in 50 grams of water
Answer:
- Absorbance of sample solution = 1.21
- Absorbance of reagent blank = 0.205
Explanation:
In order to solve this problem we need to keep in mind the <em>Lambert-Beer law</em>, which states:
Where ε is the molar absorption coefficient, b is the length of the cuvette, and C is the concentration.
By looking at the equation above we can see that if ε and C are constant; and b is 5 times higher (5.00 cm vs 1.00 cm) then the absorbance will be 5 times higher as well:
- Absorbance of sample solution = 0.242 * 5 = 1.21
- Absorbance of reagent blank = 0.041 * 5 = 0.205
Combine the two solutions. If the resulting salt is basic, you know the base was stronger. If you end up with an acidic salt, the acid was stronger.
<span>0.72 mL of solution will have 180 mg of amoxicillin.
For this problem, you need to calculate the equivalent ratio of volume as to the ratio of amoxicillin. So
180/500 = X/2.0
Multiply both sides by 2
2 * 180/500 = X
360/500 = X
18/25 = X
0.72 = X
So you need 0.72 mL of solution to get 180 mg of the drug.</span>
The jet stream is a band of reliably strong wind that plays a key role in keeping colder air north and warmer air south. But when the vortex weakens, part of the weakened low-pressure system can break off. This breaking-off process is what causes a polar vortex.
Without that strong low-pressure system, the jet stream does not have enough force to maintain its usual path. It becomes wavy and rambling. When high-pressure systems get in its way, a collection of cold air pushes south, along with the rest of the polar vortex system
