Answer:
The solution has 11.4 μg protein
Explanation:
Hi there!
The corrected absorbance will be the measured absorbance minus the absorbance of the blank that is a solution without protein.
Then, the corrected absorbance will be:
0.276 - 0.061 = 0.215
Now, using the equation of the calibration curve, we can obtain the quantity of protein present in the solution:
0.215 = 0.0182x + 0.007
(0.215 - 0.007) / 0.0182 = x
x = 11.4 μg
The solution has 11.4 μg protein
The balanced equation for the reaction between Ba(OH)₂ and HCl is ;
Ba(OH)₂ + 2HCl ----> BaCl₂ + 2H₂O
When equal volumes of both acid and base are added, the pH is 7 which means its neutral.
This means that the H⁺ ions and OH⁻ are equal and they have neutralised each other. All the ions have reacted to form water molecules.
Dissociation of base and acid are as follows;
Ba(OH)₂ ---> Ba²⁺ + 2OH⁻
1 mol of Ba(OH)₂ dissociates to 2 mol H⁺
HCl ---> H⁺ + Cl⁻
n moles of HCl give out n mol of H⁺ ions
H⁺ = OH⁻ which is why solution is neutral
then OH⁻ moles present are n mol
then Ba(OH)₂ moles present should be n/2 mol
molarity of HCl = 0.5 mol/L
since volumes are equal number of moles are directly proportional to molarity
molarity of Ba(OH)₂ = 0.5/2 = 0.25 M
Answer:
strong acid and weak base
Explanation:
#carryonlearning
The answer to this problem is a physical change
Answer:
5. gains two electrons.
Explanation:
In order to determine the most stable monoatomic ion of oxygen, we need to consider the octet rule: atoms will gain, lose or share electrons to complete their valence shell with 8 electrons.
Oxygen is in the Group 16 in the Periodic Table, so it has 6 valence electrons. Therefore, it will gain two electrons to have the electron configuration of the closest noble gas.
