Chemistry, 26.09.2019 21:00 pr173418

1) was the ph of any of the solutions significantly different than what you hypothesized? explain 2) what is the ph range of the solutions you tested? are any of the solutions very acidic or very basic? 3) what does ph measure? 4) compare the hydrogen ion concentration in vinegar to window cleaner. 5) is ph an absolute or a relative measure? explain 6) word origins. the p in ph stands for the german word potenz, which means "power" or "potential". the h represents the hydrogen ions (h+). how are these related to the definition of ph? 7) describe the relationship between the hydrogen ions (h+) and ph. how is ph related to a solution’s acidity? 8) do you notice anything about the solutions on the ph scale, their ph, and their location on the ph scale?

Answers: 3

Show answers

Answers

Answer from: Quest

the missing options are :

(1) lower boiling point and a lower freezing point(2) lower boiling point and a higher freezing point(3) higher boiling point and a lower freezing point(4) higher boiling point and a higher freezing point

answer : the correct answer is option (3) higher boiling point and a lower freezing point

explanation :

when a non volatile solute is added to a solvent like water, it results in elevation of boiling point.

let us find the increase in boiling point of water when cacl₂ is added to water to make a solution of 1 m

step 1 : find molality of the solution

let us assume we have 1 l of solution.

$m = \frac{moles (solute)}{l ( solution)}$

$1 m = \frac{moles (cacl_{2})}{1 l }= 1 mol cacl_{2}$

let us convert this to grams of cacl₂.

molar mass of cacl2 is 111 g/mol

grams of cacl₂ = $1 mol \times \frac{111g}{mol} = 111 g cacl_{2}$

mass of solute = 111 g

assuming density of solution same as water which is 1g/ml we have ,

mass of solution = density * volume

mass of solution = $\frac{1g}{ml} \times 1000 ml = 1000 g$

mass of solution = mass of solvent + mass of solute

mass of solute = 1000g - 111g

mass of solute 889 g = 0.889 kg

the molality of the solution can be calculated as

$molality = \frac{mol (solute)}{kg ( solvent)}$

$molality = \frac{1mol}{0.889kg}$

molality = 1.12 m

step 2 : find boiling point elevation.

the elevation in boiling point is calculated as

$\bigtriangleup t_{b} = i \times k_{b} \times m$

here δtb = boiling point elevation

i = vant hoff factor which is the number of ions formed by the solute .

cacl₂ dissociates as $cacl_{2} \rightarrow ca^{2+} + 2 cl^{-}$

it forms 3 ions . therefore,

i = 3

m = molality which is 1.12 m

kb is constant for a given solvent. for water it is 0.512

$\bigtriangleup t_{b} = 3 \times 0.512 \times 1.12$

$\bigtriangleup t_{b} = 1.7$

the boiling point of water increases by 1.7 °c

step 3: find freezing point depression.

when a non volatile solute is added to water, it results in decrease in freezing point.

the formula to find freezing point depression is

$\bigtriangleup t_{f} = i \times k_{f} \times m$

kf is constant for water and its value is 1.86

$\bigtriangleup t_{f} = 3 \times 1.86 \times 1.12$

$\bigtriangleup t_{f} = 6.2$

the freezing point of water decreases by 6.2 °c

therefore we can say that, the solution will have a higher boiling point and a lower freezing point

Answer from: Quest

Aand x are the answers to your question.hope it !

Answer from: Quest

Biome: a large naturally occurring community of flora and fauna occupying a major habitat, forest or tundraecosystem: a biological community of interacting organisms and their physical environment.hope this

Answer from: Quest

Just want to get ponts

Another question on Chemistry

Chemistry, 22.06.2019 12:00

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients

Answers: 1

Answer

Chemistry, 22.06.2019 14:00

Which of the following is true about a carbonated soft drink? . the carbon dioxide is the solvent, and water is the solute.. the water is the solution, and carbon dioxide is the solvent.. the carbon dioxide is the solution, and the water is the solvent.. the water is the solvent, and the carbon dioxide is the solute.. .

Answers: 1

Answer

Chemistry, 22.06.2019 15:10

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Answers: 1

Answer

Chemistry, 22.06.2019 18:30

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Answers: 1

Answer

You know the right answer?

1) was the ph of any of the solutions significantly different than what you hypothesized? explain 2...