Bromocresol Green belongs to a class of dyes called as <span>Sulfonephthaleins. This dye imparts different colours at different pH's.
Colors at different pH:
</span> Bromocresol Green has a transition pH range between 3.8 and 5.4.
Color Below pH 3.8:
Bromocresol Green imparts Yellow color below pH 3.8.
Color Above pH 5.4:
Bromocresol Green imparts Blue color above pH 5.4.
Due to different colors at different pH this compound is used at Indicator in quantitative analysis techniques like Titration.
Result:
Bromocresol Green will give Blue color at pH 7.
Answer:
volume = 0.288 L
Explanation:
To find the volume, you need to (1) convert grams LiBr to moles LiBr (via molar mass) and then (2) calculate volume (via molarity equation). It is important to arrange the ratios in a way tat allows for the cancellation of units (desired units in the numerator).
<u>(Step 1)</u>
Molar Mass (LiBr): 6.9410 g/mol + 79.904 g/mol
Molar Mass (LiBr): 86.845 g/mol
100 grams LiBr 1 mole
----------------------- x ------------------ = 1.15 moles LiBr
86.845 g
<u>(Step 2)</u>
Molarity (M) = moles / volume (L)
4 M = 1.15 moles / volume
(4 M) x volume = 1.15 moles
volume = 1.15 moles / 4 M
volume = 0.288 L
Answer:
-8.64kJ
Explanation:
Based on the reaction:
2 H₂O₂(l) → 2 H₂O(l) + O₂(g) ΔH = -196 kJ
When 2 moles of hydrogen peroxide (H₂O₂) descomposed, there are released -196kJ of energy.
Now, if 3,00g of hydrogen peroxide react, moles are:
3.00g × (1mol / 34.01g) = 0.0882moles H₂O₂
Releasing:
0.0882moles H₂O₂ × (-196kJ / 2mol H₂O₂) = <em>-8.64kJ</em>
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