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3 years ago

15

Which solution contains phenolphthalein pink?

2 answers:

icang [17]3 years ago

8 0

Any liquid with a pH above 8.2.

Phenolphthalein is naturally colorless but turns pink in alkaline solutions. The compound remains colorless throughout the range of acidic pH levels but begins to turn pink at a pH level of 8.2 and continues to a bright magenta at pH 10 and above.

finlep [7]3 years ago

6 0

If hydrogen ions (H+, as found in an acid) were added to the pink solution, the equilibrium would switch, and the solution would be colorless. Adding hydroxide ions (OH-, as found in bases) will change the phenolphthalein into its ion and turn the solution pink.
Chemical formula: C20H14O4
Solubility in water: 400 mg/L
GHS precautionary statements: P201, P281, P308+313

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(a) Find ΔS°rxn for the formation of Cu2₂O(s) from its elements.

Strike441 [17]

$-75.6 Jmol^{-1}K^{-1}$ is the ΔS°rxn for the formation of Cu₂O(s) from its elements.

WHAT IS ΔS°rxn FOR THE REACTION ?

The direction of spontaneous change is the direction in which total entropy increases. Total entropy change, also called the entropy change of the universe, is the sum of the entropy change of a system and of its surroundings

Standard entropy change of below reaction (ΔS° $_{rxn}$ )

$2Cu(s) + \frac{1}{2} O_2(g) --------- > Cu_2O$ ∴ ΔH° $_{rxn}$ = - 168.6 KJ/mol

Now, $\Delta S^o_{rxn} = S^o_{(products)} - S^o_{(reactants)}$

$= S^o_{Cu_2 O(s)} - [2 * S^o_{Cu(s)} + \frac{1}{2}(S^o_{O_2(g)}]$

$= (93.1 J/molK)- [2 * 133.1 + \frac{1}{2}(205.0)]J/molK$

$= - 75.6 J/molK$

Thus, -75.6 J/mol K is the ΔS°rxn for the formation.

Learn more about ΔS°rxn FOR THE REACTION are:

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2 years ago

What is the element with the symbol Ba?

Vika [28.1K]

Answer:

Barium

Explanation:

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4 years ago

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Ordinarily, when we talk about green infrastructure, what type of public element are we most likely to be discussing?

Hitman42 [59]

Parks and open spaces
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3 years ago

A reaction where one element takes the place of another element in a compound is an example of which type of reaction? A. Single

Shtirlitz [24]

A. Single Replacement

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4 years ago

1.40 m3 is how many mL

Zarrin [17]

$\LARGE{ \boxed{ \rm{ \pink{Solution:}}}}$

We know, 1 m³ of space can hold 1000 l of the substance.

⇛ 1 m³ = 1000 l----(1)

And, 1 l is 1000 times more than 1 ml

⇛ 1 l = 1000 ml------(2)

So, From (1) and (2),

⇛ 1 m³ = 1000 × 1000 ml

⇛ 1m³ = 1000000 ml

We had to find,

⇛ 1.40 m³ = 1.40 × 1000000 ml

⇛ 1.40 m³ = 140/100 × 1000000 ml

⇛ 1.40 m³ = 1400000 ml

⇛ 1.40 m³ = 14,00,000 ml / 14 × 10⁵ ml / 1.4 × 10⁶ ml

☃️ <u>So</u><u>,</u><u> </u><u>1.40</u><u> </u><u>m</u><u>³</u><u> </u><u>=</u><u> </u><u>1</u><u>4</u><u> </u><u>×</u><u> </u><u>1</u><u>0</u><u>⁵</u><u> </u><u>m</u><u>l</u><u> </u><u>/</u><u> </u><u>1.4</u><u> </u><u>×</u><u> </u><u>10</u><u>⁶</u><u> </u><u>ml</u><u>.</u>

<u>━━━━━━━━━━━━━━━━━━━━</u>

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3 years ago

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