Answer:
Hello your question is incomplete attached below
A student titrated 50.0mL of a 0.10M solution of a certain weak acid with NaOH(aq). The results are given in the graph above.
answer : pH > 3.5
Explanation:
During the titration before the equivalence point the solution will behave as a buffer system of a weak acid and base ( conjugated )
when pH ~ pka the concentration of weak acid = base ( conjugated ) hence when the pH value crosses the pka value , the concentration of the pH value will drop lower than the value of the conjugated base
hence the pH value ≥ 3.5
Answer:
30.0 L.
Explanation:
- To solve this problem; we must mention the rule states the no. of millimoles of a substance before and after dilution is the same.
<em>(MV)before dilution = (MV)after dilution</em>
M before dilution = 5.0 M, V before dilution = 3.0 L.
M after dilution = 0.5 M, V after dilution = ??? L.
∵ (MV)before dilution = (MV)after dilution
∴ (5.0 M)(3.0 L) = (0.5 M)(V after dilution)
<em>∴ V after dilution = (5.0 M)(3.0 L)/(0.5 M) = 30.0 L.</em>
The enthalpy of the change of the reaction P₄O₆ + 2O₂ ------ P₄O₁₀ is -1300.1kJ.
The reactions are as follows:
P₄O₆ + 2O₂ ------> P₄O₁₀
P₄ + 3O₂ ------->P₄O₆
Here, ΔHₐ = -1640.1kJ
P₄ + 5O₂ --------> P₄O₁₀
Here, ΔHₓ = -2940.1kJ
The enthalpy change of any type of reaction depends on the initial and final states of the reactions and is independent of the path taken by the system to reach the product.
To find the overall change in enthalpy, we need to sum up the reactions at each stage. On reversing the reactions we get,
P₄O₆ ------> P₄ + 3O₂.................(1)
Here, ΔHₐ = +1640.1kJ
P₄O₁₀------> P₄ + 5O₂.................(2)
Here, ΔHₓ = -2940.1kJ
By adding (1) and (2) we get,
P₄O₆ + 2O₂ ------> P₄O₁₀
By reversing (1) the sign of the enthalpy is changed. The enthalpy is given by
ΔH = ΔHₐ + ΔHₓ
ΔH = 1640.1 + (-2940.1)
ΔH = -1300.1kJ
Therefore the enthalpy of the reaction, P₄O₆ + 2O₂ ------> P₄O₁₀ is -1300.1kJ
To know more about entropy, click below:
brainly.com/question/419265
#SPJ1
Phosphates and deoxyribose
Answer:
you see different colors because white light breaks into its different component colors - red, orange, yellow, green, blue and Violet.
The dispersion of visible light into its different colors is known as dispersion
hope it helps you
