Answer:
... mass has half life of 5 days. Calculate the mass decayed off after 15days? In Chemistry 2 Answers Available Asked by Miss Flawless on 7th July, 2018.
Explanation:
It would be NaOH + HCl → <span>NaCl + H2O
</span>
NaOH is sodium hydroxide, which is a strong base. HCl is hydrochloric acid, which is a strong acid.
You have a strong base and a strong acid on the left side, however, at the result side, you end up with NaCl + H2O. Sodium chloride is simply table salt and H2O is just water, thus it has been neutralized.
Answer:
pH = 4,70
Explanation:
For bromocresol, as HX is yellow and X⁻ is blue, the indicator will be a perfect green color when HX = X⁻.
Using Henderson-Hasselbalch formula:
pH = pka + log [X⁻]/[HX] <em>(1)</em>
Where pka is -log ka = -log2,0x10⁻⁵ = 4,70
As HX = X⁻, [HX] / [X⁻] = 1
Replacing in (1):
pH = 4,70 + log 1
pH = 4,70 + 0
<em>pH = 4,70</em>
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I hope it helps!
Answer:
1835 J
Explanation:
There are three heat flows in this question.
Heat lost by Fe + heat gained by water + heat gained by calorimeter = 0
q₁ + q₂ + q₃ = 0
m₁C₁ΔT₁ + m₂C₂ΔT₂ + q₃ = 0
Data:
m₁ = 65.06 g
C₁ = 0.450 J·°C⁻¹g⁻¹
Ti = 100.0 °C
T_f = 23.59 °C
m₂ = 32.49 g
C₂ = 4.184 J·°C⁻¹g⁻¹
Ti = 20.63 °C
T_f = 23.59 °C
Calculations:
(a) Heat lost by iron
ΔT₁ = 23.59 °C - 100.0 °C = -76.41 °C
q₁ = m₁C₁ΔT₁ = 65.06 g × 0.450 J·°C⁻¹g⁻¹ × (-76.41 °C) = -2237 J
(b) Heat gained by water
ΔT₂ = 23.59 °C - 20.63 °C = 2.96 °C
q₂ = m₂C₂ΔT₂ = 32.49 g × 4.184 J·°C⁻¹g⁻¹ × 2.96 °C = 402 J
(c) Heat gained by calorimeter
-2237 J + 402 J + q₃ = 0
-1835 J + q₃ = 0
q₃ = 1835 J
The heat gained by the calorimeter was 1835 J.
The color change of a pH indicator is caused by the dissociation of the H+ ion from the indicator.
<h3 /><h3>What is indicator?</h3>
In science, a marker capability or a trademark capability of a subset An of a set X is a capability characterized from X to the two components set {0, 1}, normally signified as, and it demonstrates whether a component in X has a place with A. Markers are insights used to gauge current circumstances as well as to figure monetary or financial patterns. In the realm of money management, pointers regularly allude to specialized diagram designs getting from the value, volume, or open revenue of a given security. Markers are insights used to gauge current circumstances as well as to conjecture monetary or financial patterns. In the realm of money management, pointers normally allude to specialized graph designs getting from the value, volume, or open revenue of a given security.
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