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3 years ago

15

What does phenolphthalein turn pink?

1 answer:

Alex Ar [27]3 years ago

8 0

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. Phenolphthalein is slightly soluble in water and usually is dissolved in alcohols for use in experiments.

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Why do solids have different densities

Kisachek [45]

Different solids tend to have different densities due to the difference in their masses or volume. We know,

Density of a substance= Mass/Volume.

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3 years ago

Zinc is more active than cobalt and iron but less active than aluminum. Cobalt is more active than nickel but less active than i

mixas84 [53]

Answer:

Option D

Explanation:

For the first statement, the order is:

=> Co < Fe < Zn < Al

For the second statement it is,

=> Ni < Co < Fe

So, combining the order becomes:

=> Ni < Co < Fe < Zn < Al

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3 years ago

Consider the balanced chemical equation below.

aleksandr82 [10.1K]

hope the picture above helps :)

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3 years ago

The average mass of a born atom is 10.81 if you were able to silate a single boron atom what is the chance that you would random

irakobra [83]

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3 years ago

What is the percent by mass of water in MgSO4 • 7H2O? A. 51.1% B. 195% C. 56.0% D. 21.0%

lbvjy [14]

Answer : The correct option is, (A) 51.1%

Explanation :

Mass percent : It is defined as the mass of the given component present in the total mass of the compound.

Formula used :

$\text{Mass} \%H_2O=\frac{\text{Mass of }H_2O}{\text{Mass of }MgSO_4.7H_2O}\times 100$

First we have to calculate the mass of $H_2O$ and $MgSO_4.7H_2O$ .

Mass of $H_2O$ = 18 g/mole

Mass of $7H_2O$ = 7 × 18 g/mole = 126 g/mole

Mass of $MgSO_4.7H_2O$ = 246.47 g/mole

Now put all the given values in the above formula, we get the mass percent of $H_2O$ in $MgSO_4.7H_2O$ .

$\text{Mass} \%H_2O=\frac{126g/mole}{246.47g/mole}\times 100=51.1$

Therefore, the mass percent of $H_2O$ in $MgSO_4.7H_2O$ is, 51.1%

6 0

3 years ago