Answer:
Hypochlorous acid - Sodium hypochlorite
Explanation:
A buffer works when pH you want is ± 1 unit of pKa of the buffer. For example, for a buffer with pKa 7, it works between 6 and 8 (7-1 and 7+1).
pKa = -log Ka:
pKa boric acid - Sodium borate: 9.23. As you want a pH of 8.0. This buffer has a pKa too high.
pKa Hypochlorous acid - Sodium hypochlorite: 7.46. With this pKa, this buffer is a great choice to prepare it with a pH = 8.0
pKa Formic acid - Sodium formate: 3.74. This pKa is too low to make a buffer with pH = 8.0
Best choice is:
<h3>Hypochlorous acid - Sodium hypochlorite</h3>
Answer:
50 degrees C I am going to assume
0 degrees C is 273.15 K so 50 plus 273.15 is 323.15K
Explanation:
Answer:
Discovery of neutron
Explanation:
Until 1932, the atom was believed to be composed of a positively charged nucleus surrounded by negatively charged electrons, after successful discovery of electron by J.J. Thompson and proton by Ernest Rutherford.
In 1932, James Chadwick bombarded beryllium atoms with alpha particles.
As Chadwick had previously seen in experiment conducted by Frédéric and Irène Joliot-Curie, they had bombarded a sample of beryllium with alpha radiation.
Chadwick repeated the experiment and observed an unknown radiation, this showed no deflection what-so-ever.
He repeated this experiment by bombarding other materials, like helium, nitrogen and lithium,
Finally, Chadwick found that this radiation was composed of particles with a neutral electrical charge and had approximate mass of a proton.
This particle was then known as the neutron.
Answer:
V₂ = 4.7 L
Explanation:
Given data:
Initial volume = 5.0 L
Initial pressure = 1.50 atm
Final pressure = 1240 mmHg (1240/760 = 1.6 atm)
Final volume = ?
Solution:
P₁V₁ = P₂V₂
V₂ = P₁V₁ / P₂
V₂ = 1.50 atm ×5.0 L/1.6 atm
V₂ = 7.5 atm. L /1.6 atm
V₂ = 4.7 L