Kinetic energy is the energy an object has as a result of its
2 answers:
Answer : The kinetic energy is the energy an object has as a result of its motion.
Explanation :
Kinetic energy : It is defined as the energy an object has due to its motion.
All the moving object have the kinetic energy. Not all moving object have the same amount kinetic energy.
That means the amount of kinetic energy depends on the mass of an object and the speed of the object.
The formula used for the kinetic energy :
where,
K.E = kinetic energy of an object
m = mass of an object
v = speed of an object
Hence, the kinetic energy is the energy an object has as a result of its motion.
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Answer:
0,542 g of Na₂HPO₄ and 0,741 g of NaH₂PO₄.
0,856 g of Tris-HCl and 0,553 g of Tris-base
Explanation:
It is possible to use Henderson–Hasselbalch equation to estimate pH in a buffer solution:
pH = pka + log₁₀
Where A⁻ is conjugate base and HA is conjugate acid
The equilibrium of phosphate buffer is:
H₂PO₄⁻ ⇄ HPO4²⁻ + H⁺ Kₐ₂ = 6,20x10⁻⁸; <em>pka=7,21</em>
Thus, Henderson–Hasselbalch equation for phosphate buffer is:
pH = 7,21 + log₁₀
If desire pH is 7,0 you will obtain:
<em>0,617 = </em><em>(1)</em>
Then, if desire concentration of buffers is 0,10 M:
0,10 M = [HPO₄²⁻] + [H₂PO₄⁻] <em>(2)</em>
Replacing (1) in (2) you will obtain:
<em>[H₂PO₄⁻] = 0,0618 M</em>
And with this value:
<em>[HPO₄²⁻] = 0,0382 M</em>
As desire volume is 100mL -0,1L- the weight of both Na₂HPO₄ and NaH₂PO₄ is:
Na₂HPO₄ = 0,1 L× ×
= 0,542 g of Na₂HPO₄
NaH₂PO₄ = 0,1 L× ×
= 0,741 g of NaH₂PO₄
For tris buffer the equilibrium is:
Tris-base + H⁺ ⇄ Tris-H⁺ pka = 8,075
Henderson–Hasselbalch equation for tris buffer is:
pH = 8,075 + log₁₀
If desire pH is 8,0 you will obtain:
<em>0,841 = </em><em>(3)</em>
Then, if desire concentration of buffers is 0,10 M:
0,10 M = [Tris-base] + [Tris-H⁺] <em>(4)</em>
Replacing (3) in (4) you will obtain:
[Tris-HCl] = 0,0543 M
[Tris-base] = 0,0457 M
As desire volume is 100mL -0,1L- the weight of both Tris-base and Tris-HCl is:
Tris-base = 0,1 L× ×
= 0,553 g of Tris-base
Tris-HCl = 0,1 L× ×
= 0,856 g of Tris-HCl
I hope it helps!