The density is the ratio between mass and volume. So the mass is the product between density and volume. But! You have to control the units of measure.
7.85 g/l = 0.00785 kg/l
41.25 ml = 0.04125 l
Mass = (0.00785) x (0.04125) = 0,00032381 kg ---> 0,32381 g
(I hope this is right )
Answer:
1
Explanation:
you needa do the last question cause i am not learning this but 1 is right
Answer:
The compound you will use is the Dibasic phosphate
Explanation:
Simple phosphate buffer is used ubiquitously in biological experiments, as it can be adapted to a variety of pH levels, including isotonic. This wide range is due to phosphoric acid having 3 dissociation constants, (known in chemistry as a triprotic acid) allowing for formulation of buffers near each of the pH levels of 2.15, 6.86, or 12.32. Phosphate buffer is highly water soluble and has a high buffering capacity,
In this case the most efficient way is to disolve the dibasic compound which in the reaction with the water will form the monobasic phosphate.
To make the buffer you have to prepare the amount of distillate water needed, disolve the dibasic phospate, and then adjust with HCl or NaOH depending on the pH needed.
Since the measurement is not changing, the answer is 100 mL. Hope this helps.
