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4 years ago

What is a solution?

1 answer:

7 0

The correct answer is a solute and a solvent

A solution is any homogenous mixture of two or more substances. It does not necessarily have to be liquid or gaseous.

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What is the molarity in 850 ml of solution containing 63 grams of Sodium Hydroxide?

STALIN [3.7K]

Answer: 1.85M

Explanation:

Sodium hydroxide has a chemical formula of NaOH

Given that,

Amount of moles of NaOH (n) = ?

Mass of NaOH in grams = 63g

For molar mass of NaOH, use the molar masses:

Sodium, Na = 23g;

Oxygen, O = 16g;

Hydrogen, H = 1g

NaOH = (23g + 16g + 1g)

= 40g/mol

Since, amount of moles = mass in grams / molar mass

n = 63g / 40.0g/mol

n = 1.575 mole

Volume of NaOH solution (v) = 850mL

[Convert 850mL to liters

If 1000mL = 1L

850mL = 850/1000 = 0.85L]

Concentration of NaOH solution (c) = ?

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

c = n / v

c = 1.575 mole / 0.85L

c = 1.85M [1.85M is the concentration in moles per litres which is also known as molarity]

Thus, the molarity of the solution is 1.85M

5 0

3 years ago

How do Earth's lithosphere,hydrosphere,and atmosphere compare?

Oduvanchick [21]

<span>the lithosphere, which contains all of the cold, hard, solid rock of the planet's crust (surface), the hot semi-solid rock that lies underneath the crust, the hot liquid rock near the center of the planet, and the solid iron core (center) of the planet </span>the hydrosphere, which contains all of the planet's solid, liquid, and gaseous water,and the atmosphere, which contains all of the planet's air

6 0

4 years ago

Read 2 more answers

A hot piece of copper was dropped into 155 g of water at 23.6 °C and 2,100 J of energy was transferred to the water. What is the

BlackZzzverrR [31]

Answer:

26.8 °C

Explanation:

Step 1: Given and required data

Mass of water (m): 155 g

Energy transferred to the water (Q): 2100 J

Initial temperature of the water (T₂): 23.6 °C

Final temperature of the water (T₁): ?

Specific heat of water (c): 4.184 J/g.°C

Step 2: Calculate the final temperature of the water

We will use the following expression.

Q = c × m × (T₂ - T₁)

T₂ = 2100 J/(4.184 J/g.°C) × 155 g + 23.6 °C = 26.8 °C

5 0

3 years ago

What is the pH of a KOH solution that has [H ] = 1. 87 × 10–13 M? What is the pOH of a KOH solution that has [OH− ] = 5. 81 × 10

vlada-n [284]

pH is the hydrogen ion concentration and pOH is the hydroxide ion concentration in the solution. pH KOH is 12.73, pOH KOH is 2.24 and pH NaCl is 7.

pH is the negative log of the hydrogen ion concentration and pOH is the negative log of the hydroxide ion concentration.

The relation between the pH and pOH can be given as, $\rm pOH = 14 - pH$

The pH of KOH can be calculated by the formula,

$\rm pH = \rm -log [H^{+}]$

In the first case, the concentration of the KOH is $1. 87 \times 10^{-13}\;\rm M$

Substituting values in the equation:

$\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 87 \times 10^{-13}\;\rm M ]\\\\&= 12.73\end{aligned}$

Hence, the pH of KOH is 12.73.

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pOH of KOH can be calculated by the formula,

$\rm pOH = \rm -log [OH^{-}]$

The hydroxide concentration of the KOH solution is $5. 81 \times 10^{-3}\;\rm M$

Substituting value in the equation:

$\begin{aligned} \rm pOH &= \rm -log [OH^{-}]\\\\&= \rm -log [5. 81 \times 10^{-3}\;\rm M ]\\\\&= 2.24 \end{aligned}$

Hence, the pOH of KOH is 2.24

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The pH of NaCl can be calculated by the formula,

$\rm pH = \rm -log [H^{+}]$

In the third case, the concentration of the NaCl is $1. 00\times 10^{-7}\;\rm M$

Substituting values in the equation:

$\begin{aligned} \rm pH &= \rm -log [H^{+}]\\\\&= \rm -log [1. 00 \times 10^{-7}\;\rm M ]\\\\&= 7 \end{aligned}$

Hence, the pH of KOH is 7.0.

Therefore, KOH is basic and NaCl is approximately neutral.

Learn more about pH and pOH here:

brainly.com/question/13885794

3 0

3 years ago

What is chemical reaction!?

Butoxors [25]

Answer:

A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another.

6 0

3 years ago

Read 2 more answers