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1 year ago

7

he concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubil

ity. What is the best way to describe this solution? a) diluted b) saturated c) unsaturated d) supersaturated The answer is NOT B.

2 answers:

dimaraw [331]1 year ago

8 0

Answer:

D

Explanation:

TiliK225 [7]1 year ago

5 0

Answer:

The answer is D: supersaturated

Explanation:

because if you increase the concentration of (a solution) beyond the saturation point the concentration of a solute in a solution is greater than the maximum concentration that is predicted from the solute's solubility.

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Lithium acetate, LiCH3CO2, is a salt formed from the neutralization of the weak acid acetic acid, CH3CO2H, with the strong base

Vesna [10]

Answer : The pH of 0.289 M solution of lithium acetate at $25^oC$ is 9.1

Explanation :

First we have to calculate the value of $K_b$ .

As we know that,

$K_a\times K_b=K_w$

where,

$K_a$ = dissociation constant of an acid = $1.8\times 10^{-5}$

$K_b$ = dissociation constant of a base = ?

$K_w$ = dissociation constant of water = $1\times 10^{-14}$

Now put all the given values in the above expression, we get the dissociation constant of a base.

$1.8\times 10^{-5}\times K_b=1\times 10^{-14}$

$K_b=5.5\times 10^{-10}$

Now we have to calculate the concentration of hydroxide ion.

Formula used :

$[OH^-]=(K_b\times C)^{\frac{1}{2}}$

where,

C is the concentration of solution.

Now put all the given values in this formula, we get:

$[OH^-]=(5.5\times 10^{-10}\times 0.289)^{\frac{1}{2}}$

$[OH^-]=1.3\times 10^{-5}M$

Now we have to calculate the pOH.

$pOH=-\log [OH^-]$

$pOH=-\log (1.3\times 10^{-5})$

$pOH=4.9$

Now we have to calculate the pH.

$pH+pOH=14\\\\pH=14-pOH\\\\pH=14-4.9=9.1$

Therefore, the pH of 0.289 M solution of lithium acetate at $25^oC$ is 9.1

4 0

2 years ago

Air tends to move from _____.

beks73 [17]

A: The Equator To The Poles

4 0

2 years ago

Read 2 more answers

The density of silver metal bar is 10.5 g/cm3 and it occupies a volume space of 0.5l. What is its mass in kilograms (kg).

mojhsa [17]

Density is equal to the ratio of mass to the volume.

The mathematical expression is given as:

$Density = \frac{mass}{volume}$

Density of silver metal bar= $10.5 g/cm^{3}$

Convert $g/cm^{3}$ into g/L

$1 cm^{3}$ = 0.001 L

Thus, density = $\frac{10.5}{10^{-3}} g/L$

= $10.5\times 10^{3}g/L$

Volume = 0.5 L

Put the values,

$10.5\times 10^{3}g/L= \frac{mass}{0.5 L}$

$m= 10.5\times 10^{3}g/L\times 0.5 L$

= $5.25 \times 10^{3}g$

Now, convert gram into kg

1 g = 0.001 kg

Therefore, mass in kg= $\frac{5.25 \times 10^{3}}{10^{-3}}$

= 5.25 kg

Thus, mass of silver metal bar in kg=5.25 kg

4 0

2 years ago

The mass unit associated with density is usually grams. if the volume (in ml or cm3) is multiplied by the density (g/ml or g/cm3

jok3333 [9.3K]

The weight in grams = 7.93 g

Given volume = 2.00 $in^{3}$

Given density = 0.242 g/ $cm^{3}$

We need to find the Mass(weight) in grams.

To find the weight in grams we need to keep in mind that the volume and density must use the same volume unit for cancellation. So that the volume units will cancel out, leaving only the mass units.

The unit of given volume is $in^{3}$ and unit of volume in density is $cm^{3}$ , so first we need to change the unit of volume from $in^{3}$ to $cm^{3}$ so that the volume units will cancel out, leaving only the mass units.

1 $in^{3}$ = 16.39 $cm^{3}$ (given conversion)

$2 in^{3}\times \frac{(16.39 cm^{3})}{(1 in^{3})}$

$in^{3}$ units get cancel out leaving the $cm^{3}$ unit.

$2 in^{3} = 32.78 cm^{3}$

Mass = Density X Volume.

Density = 0.242 g/ $cm^{3}$ and Volume = 32.78 $cm^{3}$

$Mass =0.242\frac{g}{cm^{3}}\times 32.78 cm^{3}$

Mass = 7.93 grams (g)

3 0

1 year ago

The potential energy of a catapult was completely converted into kinetic energy by releasing a small stone with a mass of 20 gra

vladimir1956 [14]

1,000 grams = 1 kilogram

20 grams = 0.02 kilogram

Kinetic energy = (1/2) (mass) x (speed)²

(1/2) (0.02) x (15)² =

(0.01) x (225) = 2.25 joules

3 0

2 years ago

Read 2 more answers