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3 years ago

Substances dissolved in a solvent are correctly known as what?

Chemistry

1 answer:

KatRina [158]3 years ago

7 0

Answer:

solute

Explanation:

The substance that dissolves is called the solute. The substance that dissolves it is called the solvent.

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Which of the following buffer systems would you use if you wanted to prepare a solution having a pH of approximately 9.5?Which o

zalisa [80]

Answer:

b. 0,08M NH₄⁺ / 0,12M NH₃

Explanation:

The buffers are:

a. 0,08M H₂PO₄⁻ / 0,12M HPO₄²⁻

b. 0,08M NH₄⁺ / 0,12M NH₃

It is possible to find out the pH of a buffer using Henderson-Hasselbalch formula:

pH = pka + log₁₀ [A⁻] / [HA] (1)

Where A⁻ is the conjugate base of the weak acid, HA.

a. For the system H₂PO₄⁻ / HPO₄²⁻ pka is 7,198. Replacing in (1)

pH = 7,198 + log₁₀ [0,12] / [0,08]

pH = 7,37

That means this buffer system don't have a pH of approximately 9,5

b. For the system NH₄⁺ / NH₃ pka is 9,3. Replacing in (1)

pH = 9,3 + log₁₀ [0,12] / [0,08]

pH = 9,50

That means this buffer system is the buffer you need to use.

I hope it helps!

7 0

4 years ago

Convert 3.45 g/ml to lb/in^3

Alja [10]

The answer is

0.124639157 pounds.

I converted it.

5 0

3 years ago

A certain chemical reaction releases 36.2 kJ/g of heat for each gram of reactant consumed. How can you calculate what mass of re

Lilit [14]

Answer:

0.038 g of reactant

Explanation:

Data given:

Heat release for each gram of reactant consumption = 36.2 kJ/g

mass of reactant that release 1360 J of heat = ?

Solution:

As 36.2 kJ of heat release per gram of reactant consumption so first we will convert KJ to J

As we know

1 KJ = 1000 J

36.2 kJ = 36.2 x 1000 = 36200 J

So it means that in chemical reaction 36200 J of heat release for each gram of reactant consumed so how much mass of reactant will be consumed if 1360 J heat will release

Apply unity formula

36200 J of heat release ≅ 1 gram of reactant

1360 J of heat release ≅ X gram of reactant

Do cross multiplication

X gram of reactant = 1 g x 1360 J / 36200 J

X gram of reactant = 0.038 g

So 0.038 g of reactant will produce 1360 J of heat.

5 0

3 years ago

What is the density, in g/cm3, of an object with a mass of 21 g and volume of 15 cm3?

maks197457 [2]

Answer:

1.4 g/cm^3

Explanation:

Density = Mass/Volume

Density = 21g/15cm^3

Density = 1.4 g/cm^3

Hope this helps!!!

-Unicorns110504

*Please mark brainliest*

4 0

3 years ago

Read 2 more answers

Which of the following elemental sequence represents an increase in atomic size?

xz_007 [3.2K]

Answer:

A) B, C, Na, AI, K

Explanation:

This is because from the periodic table, the atomic size of each element increases as we go along the periodic table.

The atomic numbers of the elements are B = 5, C = 6 , Na = 11, Al = 13 and K = 19.

The electronic configuration of each element is given as follows

B = 2, 3; C = 2, 4; Na = 2, 8, 1; Al = 2, 8, 3 and K = 2, 8, 8, 1

Since the atomic numbers increase from left to right as we go along the periodic table, their atomic sizes also increase.

Also, from their electronic configurations, Boron (B)and Carbon (C) only have electrons on the K and L shell. Sodium (Na) and Aluminium (Al) have electrons on the K, L and M shells while Potassium (K) has electrons on the K, L, M and N shells.

So, the larger the electronic configuration, the larger the atomic radius and thus atomic size.

So, they increase in the order B, C, Na, Al, K

3 0

3 years ago