What is the number of proton in this atom
1 answer:
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Answer:
Initial pH of this pH = 7.453
pH after addition of 150.0 mg of HBr = 7.35
pH after addition of 85.0 mg of NaOH 0.154 = 7.56
Explanation:
Since Ka value isn't given
so we use Ka value of HClO (hypo chlorous acid) = 3 x 10⁻⁸
pKa = - logKa = 7.52
Part A
Using Henderson equation
pH = pka + log
pH = 7.52 + log
pH = 7.453
Part B
pH after addition of 150 mg of HBr
moles of HBr
Moles of NaOCl in 100 ml buffer solution = = 0.015
Moles of HClO in 100 ml buffer solution = = 0.0175
Since H⁺ concentration furnished by HBr acid make a common ion effect . So the following reaction carried out
ClO⁻ + H⁺ → HClO
So the remaining concentration of ClO⁻ in solution = 0.015 - 0.000185
= 0.0132
moles of HClO = 0.0175 + 0.00185
= 0.0194
Using Henderson equation pH = Pka + log
= 7.52 + log
= 7.35
Part C
pH after addition of 85 mg of HBr
moles of NaOH
So the remaining concentration of ClO⁻ in solution = 0.015 + 0.00213
= 0.0171
Moles of concentration of ClO⁻ = 0.171(M)
moles of HClO = 0.0175 - 0.00213
= 0.0154
Moles in 100 ml Buffer = 0.154(M)
Using Henderson equation pH = Pka + log
= 7.52 + log
= 7.56
Answer:
Object 4 in the example
Explanation:
For simplicity and a clearer view of this problem, let's assume that four masses from 1 to 4 have the the masses 2 kg, 4 kg, 6 kg, 8 kg respectively.
According to the second Newton's law, we know that force is directly proportional to both mass and acceleration. The equation representing this is .
Notice that all of them have the same acceleration. This means, the greater the mass, the greater the force for a fixed acceleration. Simply speaking, the forces for each of the objects would be 2a, 4a, 6a and 8a respectively.
Since we're interested in the magnitude of the force and not direction, we neglect whether acceleration is positive or negative. This means that object 4 will require the greatest force to move, as it has the greatest mass.