Find the pH of 0.0025M sodium benzoate

Magnesium sulfate forms a hydrate with the formula $MgSO_4. 7H_20$ . What is the maximum amount of water (in grams) that can be removed from 15 ml of toluene by the addition of 200 mg of anhydrous magnesium sulfate? The molar mass of $MgSO_4$ is 120.4 g/mol; H20 = 18 g/mol.

Answer:

The value is $z = 0.2093 \ g$ of $H_2O$

Explanation:

From the question we are told that

The volume of toluene is $V = 15 mL$

The mass of anhydrous magnesium sulfate is $m = 200m g = 200 *10^{-3} \ g$

The formula of the hydrate is $MgSO_4. 7H_20$

The molar mass of $MgSO_4$ is $z =120.4 \ g/mol$

From the formula given we see that

1 mole of $Mg SO_4$ wil remove 7 moles of $H_2O$ to for the given formula

Hence

120.4 g (1 mole) will remove 7 moles (7 * 18 g = 126 g ) of $H_2O$ to for the given formula

Therefore 1 g of $Mg SO_4$ x g of $H_2O$

So

$x = \frac{x]126 * 1}{ 120.4 }$

=> $x = 1.0465 \ g$

From our calculation we obtained that

1 g of $Mg SO_4$ will remove $x = 1.0465 \ g$ of $H_2O$

Then

$200 *10^{-3} \ g$ of $Mg SO_4$ will remove z g of $x = 1.0465 \ g$ of $H_2O$

So

$z = 200 *10^{-3} * 1.0465$

=> $z = 200 *10^{-3} * 1.0465$

=> $z = 0.2093 \ g$ of $H_2O$

6 0

3 years ago

How are chemical reactions used in art

Aliun [14]

Answer:

Chemistry reactions are used in art for the following processes;

1) Analog photography

The photographic paper used in analog photography react when exposed to light such that the image on the film stains the photopaper

A series of chemicals are further used to develop the images now carried on the paper and water is used to rinse of the chemicals after the other chemical processes are complete

The photopaper, now bearing the developed photo is hung for it to be dried

2) Paint used for painting consists of several chemicals, including, minerals that serve as pigment, oils that serve as carrying agent, a thinner to prevent the paint from turning to solid

An artist therefore combines different chemicals for a given paint task

3) In the sculpting process

An original sculpture is produced by the artist with the aid of clay or plaster, from the original sculpture, on which wax coatings and chemicals are used to make a replica mold.

Copies of the sculpture can then be made by pouring material into the mold

Explanation:

7 0

2 years ago