What is the pH of a solution prepared by dissolving 7.0 g of tris (FM 121.14) plus 12.0 g of tris hydrochloride (FM 157.60) in 250 mL water

Explanation:

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In this case, considering that TRIS is a weak base and the TRIS hydrochloride its conjugate acid with a pKa of about 8.08, we can use the Henderson-Hasselbach equation in order to compute the pH of the described solution:

Next, we compute the concentrations of TRIS and TRIS hydrochloride as shown below (mol/L):

Then, the pH:

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explanation:

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explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.