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4 years ago

What do strong and weak acids have in common?

Chemistry

2 answers:

Art [367]4 years ago

7 0

Answer:

D. Litmus paper test

Explanation:

The strength of an acid does not effect the color change of the litmus paper.

Natali5045456 [20]4 years ago

4 0

Answer:

All the above

Explanation:

A. Electrical current conduction

Aqueous solutions of both strong and weak acids will conduct an electric current. Weak acids are poorer conductors because they produce fewer ions.

B. Reaction with magnesium

Both strong and weak acids will react with magnesium, although weak acids will react more slowly.

C. pH paper test

Both strong and weak acids will give a colour with pH test paper, although the colours will probably be different.

D. Litmus paper test

Both strong and weak acids will turn blue litmus red.

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If a 95.27 mL sample of acetic acid (HC2H3O2) is titrated to the equivalence point with 79.06 mL of 0.113 M KOH, what is the pH

KATRIN_1 [288]

Answer:

8.73

Explanation:

The concentration of acetic acid can be determined as follows:

$M_1V_1 = M_2V_2\\(KOH) = (CH_3COOH)$

$M_{KOH}=0.113 M\\V_{KOH}=79.06 mL$

$V_{CH_3COOH}=95.27 \\\\M_{CH_3COOH)=?????$

$M_{CH3COOH} = \frac{M_{KOH}*V_{KOH}}{V_{CH_3COOH}}$

$M_{CH3COOH} = \frac{0.113*79.06}{95.27}$

$M_{CH3COOH} = 0.094 M$

Moles of $CH_3COOH$ = $95.27* 10^{-3}* 0.094$

=0.0090 moles

Moles of $KOH = 79.06*10^{-3}*0.113$

= 0.0090 moles

The equation for the reaction can be expressed as :

$CH_3COOH$ $+$ $KOH$ -----> $CH_3COO^{-}K^+$ $+$ $H_2O$

Concentration of $CH_3COO^{-$ ion = $\frac{0.0090}{Total volume (L)}$

= $\frac{0.0090}{(95.27+79.06)} *1000$

= 0.052 M

Hydrolysis of $CH_3COO^{-$ ion:

$CH_3COO^{-$ $+$ $H_2O$ -----> $CH_3COOH$ $+$ $OH^-$

$K = \frac{K_w}{K_a} = \frac{x*x}{0.052-x}$

⇒ $\frac{10^{-14}}{1.82*10^{-5}}= \frac{x*x}{0.052-x}$

= $0.5494*10^{-9}= \frac{x*x}{0.052-x}$

As K is so less, then x appears to be a very infinitesimal small number

0.052-x ≅ x

$0.5494*10^{-9}= \frac{x^2}{0.052}$

$x^2 = 0.5494*10^{-9}*0.052$

$x^2 = 0.286*10^{-10$

$x = \sqrt{0.286*10^{-10$

$x =0.535*10^{-5}M$

$[OH] = x =0.535*10^{-5}$

$pOH = -log[OH^-]$

$pOH = -log[0.535*10^{-5}]$

$pOH = 5.27$

pH = 14 - pOH

pH = 14 - 5.27

pH = 8.73

Hence, the pH of the titration mixture = 8.73

8 0

3 years ago

Which branch of chemistry is concerned with the detection or identification of substances present in a sample and their amount?

Verizon [17]

Answer:

The <u>detection</u> of iron in a mixture of metals for example , or in a compound such as magnetite, is a branch of analytical chemistry called qualitative analysis. <u>Measurement</u> of the actual amount of a certain substance in a compound or mixture is termed quantitative analysis.

6 0

3 years ago

How many valence electrons does carbon have? how does this affect the variety of molecules it makes?

Fantom [35]

Carbon has 4 electrons in its outermost shell.it shows tetravalency and catination property hence forms long chain of carbon .

4 0

3 years ago

determine the total pressure of gas mixture the contains oxygen, nitrogen, and helium if the partial pressures of the gases are

timurjin [86]

0.922 atm is the total pressure of gas mixture that contains oxygen, nitrogen and helium gases.

Explanation:

Data given:

partial pressure of the oxygen p $O_{2}$ = 0.197 atm

partial pressure of the nitrogen gas p $N_{2}$ = 0.461 atm

partial pressure of the helium gas pHe = 0.264

total pressure P in the gas mixture= ?

We know that individual gases exert pressure on the mixture of gases independently. From Dalton's law of pressure it is said that sum of partial pressure of all the gases in the mixture equals its total pressure. So,

Ptotal = p $O_{2}$ + p $N_{2}$ + pHe

putting the values in the mixture:

Ptotal = 0.197 + 0.461+ 0.264

Ptotal = 0.922 atm

Total pressure is 0.922 atm.

7 0

3 years ago

We call the elements in the blocks of periods 4-7 and groups 3-12 the

d1i1m1o1n [39]

The elements in the blocks of period 4-7 and group 3-12 in the periodic table are in the d-block and d-block elements are known as transition metals or transition elements.
Arsenic is a metalloid and it has four electron shells and five valence electrons.
the s and p orbital of Arsenic have 2 and 3 electrons respectively and which makes five valence electrons.

7 0

3 years ago