Answer is: pH of solution is 3,02.
c(benzoic acid) = 0,03 mol/dm³.
c(sodium benzoate) = 0,02 mol/dm³.
pKa(benzoik acid) = 3,19.
pH = ?
Henderson–Hasselbalch equation for buffers: pH = pKa + log(cs/ck)
pH = 3,19 + log(0,02/0,03)
pH = 3,19 - 0,176
pH = 3,02.
cs - concentration of acid.
Water molecules are made of hydrogen atoms and one oxygen atom.
Hope this helped!
Answer:
0.0196
Explanation:
The Total volume of the solution = Volume of 
= 10 mL + 10 mL + 10 mL+ 10 mL + 1 mL + 10 mL
= 51 mL
The concentration of ![[H^+] = \dfrac{ mL \ used \times 0.1 \ M}{total \ volume}](https://tex.z-dn.net/?f=%5BH%5E%2B%5D%20%3D%20%5Cdfrac%7B%20mL%20%5C%20used%20%5Ctimes%200.1%20%5C%20M%7D%7Btotal%20%5C%20volume%7D)
= 0.0196
Cells are too small to see with the naked eye.
It's pretty straight forward, use the cross-out method.
1) Microscopes MAGNIFY images, they don't color the cells. In fact, scientists have to use these chemicals to "stain" or color the cells to see them more easily through microscopes.
2) If the lenses of a microscope reduced the image of an organism to the size of a cell, you'd be seeing a very tiny human through your microscope, instead of actual cells.
3) Microscopes don't "trap" anything. In fact, scientists use plates or slides under microscopes to contain what they're studying.
Answer:
6.68 x 10^-4
Explanation:
131g ÷ 261.337g/mol = 0.5012685 moles
0.5012685 moles ÷ 750.0 liters =
0.5012685÷ 750.0=0.000668358
6.68 x 10^-4
