An ammonia solution has a pH of 11.30, what is the H3O+ concentration in this so

Question

An ammonia solution has a pH of 11.30, what is the H3O+ concentration in this solution? a. 5.0 times 10^-23 M b. 2.0 times 10^-9 M c. 5.0 times 10^-12 M d. 2.0 times 10^11 M e. 2.0 times 10^-7 M 2. Which of the following occurs when hydrogen chloride gas is dissolved in water to form hydrochloric acid? a. A complex between HCl and water is formed. b. H+ is transferred from HCl to water. c. H+ is transferred from water to HCl. d. There is no reaction, HCl molecules remain present. e. A neutral solution forms 3. Which of the following can be characterized as a strong electrolyte? a. 0.001 M HCl b. 3.0 M HCl c. 1.00 M HC_2 H_3O_2 d. both a and b e. both a and c 4. Which of the following is generally true of most organic compounds? a. their bonding is covalent in nature b. their aqueous solutions conduct electricity c. they have high melting points d. they are composed of nonmetals and metals e. their intermolecular forces are dominated by ionic interactions 5. If the bond angles at a carbon atom are 1095 how many groups are distributed around the carbon atom? a. 1 b. 2 cf. 3 d. 4 e. 5 Which of the following is the correct molecular formula for hexane? a. C_6H_8 b. C_6H_10 c. C_6H_12 d. C_6H_14 e. C_6H_16

Explanation / Answer

1) Given pH = 11.30

We know that, pH = -log[H3O+]

11.30 = -log[H3O+]

[H3O+] = 10-11.30= 5.0 x 10-12

2) when HCl gas dissolved in water it will presents in the form of H+ and Cl-ions and the H+ ions forms H3O+

Option b is the correct answer.

3)Strong electrolyte is the compound which can completely dissolve in water. From the given options both can dossolve in water but only HCl is the strong acid hence strong electrolyte. Option d is the right answer.

4) Almost all the organic componds are covalent bonding in nature.

Aqueous solutions of only few organic compounds conducts electricity.

Organic compounds have low melting points.

Organic compounds contains mostly carbon and hydrogen

They contain single, double, triple covalent bonds

Option a is the correct answer.

5) Bond angle of 109.5 degrees corresponds to tetrahedral geometry and the carbon has four groups.

Option d is the correct answer.

6) general formula for Alkanes is CnH2n+2

Where n is the length of the carbon chain

We have 6 carbons in Hexane , so the formula is C6H14

Option d is the right answer.

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