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3 years ago

What color would a phenolphthalein solution be at ph=11 ?

Chemistry

2 answers:

saveliy_v [14]3 years ago

8 0

Answer:

Pink

Explanation:

The Ph scale is used to determine if a chemical compound is an acid, a base or neutral. The scale ranges from 0 to 14.

Acids turn litmus red and have a ph range between 0 and 6.9. Bases turn litmus blue and have a ph range between 8.2 and 14.

Phenolphthalein is ordinarily colorless however, in a basic solution which gives a ph of 11, it is is gives a pink coloration.

Sloan [31]3 years ago

5 0

Colurs of Phenolphthalein at different pH's are as follow,

When pH is less than zero, means when the conditions are strongly acidic then it imparts Orange Color.

At pH ranging from zero to 8.2 (acidic or weakly acidic conditions) it is colorless.

At pH ranging from 8.2 to 12 (Basic conditions) it imparts Pink color.

At pH greater than 13 (strongly basic) it is again Colorless.

Result:
So, At pH = 11 phenolphthalein solution gives Pink Color.

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Urgent help please!!

sveta [45]

Answer:

1. 2.1 moles of Mg

2. 0.72 mole of Mg(OH)2

Explanation:

1. We'll begin by writing the balanced equation for the reaction. This is given below:

3Mg + 2AlBr3 —> 3MgBr2 + 2Al

From the balanced equation above, 3 moles of Mg reacted to produce 2 moles of Al.

Therefore, Xmol of Mg will react to produce 1.4 moles of Al i.e

Xmol of Mg = (3 x 1.4)/2

Xmol of Mg = 2.1 moles.

Therefore, 2.1 moles of Mg is required to 1.4 moles of Al.

2. We'll begin by calculating the number of mole in 26g of water, H2O.

This is illustrated below:

Molar mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O = 26g

Number of mole of H2O =?

Mole = Mass /Molar Mass

Number of mole of H2O = 26/18

Number of mole of H2O = 1.44 moles

Next, we shall write the balanced equation for the reaction. This is given below:

2HNO3 + Mg(OH)2 —> Mg(NO3)2 + 2H2O

Finally, we can obtain the number of mole of Mg(OH)2 used in the reaction as follow:

From the balanced equation above,

1 mole of Mg(OH)2 reacted to produce 2 mole of H2O.

Therefore, Xmol of Mg(OH)2 will react to produce 1.44 moles of H2O i.e

Xmol of Mg(OH)2 = (1 x 1.44)/2

Xmol of Mg(OH)2 = 0.72 mole.

Therefore, 0.72 mole of Mg(OH)2 was used in the reaction.

3 0

3 years ago

A boy found a solid metal box in his backyard. The box had been buried for so long, it was difficult to determine from what the

Alex777 [14]

Answer:

Box is made up of copper, because density is 8.96 g/cm³.

Explanation:

Given data:

Volume of box = 17.63 cm³

Mass of box = 158 g

Which metal box is this = ?

Solution:

First we will calculate the density of box then we will compare it with the density value of given metals.

d = m/v

d = 158 g/ 17.63 cm³

d = 8.96 g/cm³

The calculated density is similar to the given density value of copper thus box is made up of copper.

4 0

3 years ago

What does electronegativity measure

Rainbow [258]

Electronegativity is a measure of an atom's ability to attract shared electrons to itself. On the periodic table, electronegativity generally increases as you move from left to right across a period and decreases as you move down a group.

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3 years ago

When one type of energy is transformed into another type of energy during a conversion, _______ is lost to the environment.

Musya8 [376]

A)HEAT is lost to the environment......

6 0

3 years ago

4.4 grams of CO2 represents how many moles?

jeka57 [31]

Answer:

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8 0

3 years ago