Download App

Equilibrium — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEquilibrium5 Marks
Question
What do you understand by following?
  1. Dissociation constant of an acid.
  2. Buffer solution.
  3. Solubility product.
✓

Answer

  1. Dissociation Constant of an Acid $K_a$: It measures the ability of an acid to lose [$H^+$] experimentally.
$\text{CH}_3\text{COOH}(\text{l})+\text{H}_2\text{O}(\text{l})\\\rightleftharpoons\text{CH}_3\text{COO}^-(\text{aq})+\text{H}_3\text{O}^+(\text{aq})$
$\text{K}_{\text{a}}=\frac{[\text{CH}_3\text{COO}^-][\text{H}_3\text{O}^+]}{[\text{CH}_3\text{COOH}]}$
  1. Buffer Solution: The solution whose pH does not change by adding small amount of H+ or $OH^+$ is called buffer solution. e.g. mixture of $CH_3COOH$ and $CH_3COONa$ is a buffer solution.
  2. Solubility Product: It is a product of molar concentration of ions formed in a saturated solution at a given temperature raised to the power equal to the number of each ions formed by 1 mole of sparingly soluble compound.
$\text{e.g. AgCl}(\text{s})\rightleftharpoons\text{Ag}^+(\text{aq})+\text{Cl}^-\text{(aq)};$
$\text{K}_{\text{sq}}=[\text{Ag}^+][\text{Cl}^-]$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "5 Marks Questions" from Equilibrium→Equilibrium — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

What are extensive qualities and intensive qualities? Explain.
→
1. During estimation of nitrogen present in an organic compound by Kjeldahl's method, the ammonia evolved from 0.5 g of the compound in Kjeldahl's estimation of nitrogen, neutralized 10 mL of $1 M H _2 SO _4$. Find out the percentage of nitrogen in the compound.
2. Explain why $\left( CH _3\right)_3 \stackrel{+}{ C }$ is more stable than $CH _3 \stackrel{+}{ C } H _2$ and $\stackrel{+}{ C } H _3$ is the least stable cation.
→
What is the valence shell electron pair repulsion principle? Explain how this determines the geometry of molecules.
→
Consider the cell reaction of an electrochemical cell:
$\text{Ni}\text{(s)}+2\text{Ag}^+\text{(aq)}\xrightarrow{\ \\ \ \ \ \ }\text{Ni}^{2+}\text{(aq)}+2\text{Ag}\text{(s)}$
Answer the following questions:
  1. Write anode and cathode half reactions.
  2. Mention the direction of flow of electrons.
  3. How is the electroneutrality maintained in solution of two half cells?
  4. Write the formula for calculating standard e.m.f of this cell.
  5. How does e.m.f. change when concentration of $Ag^+$ is decreased?
→
1. Suggest a method to purify
i. a liquid which decomposes at its boiling point.
ii. kerosene oil containing water.
iii. camphor containing traces of common salt.
2. Giving justification, categorise the following molecules/ions as nucleophile or electrophile:
$
\begin{aligned}
& HS^{-}, BF_3, C_2 H_5 O^{-},\left(CH_3\right)_3 N:, \\
& C \stackrel{+}{l}, C H_3-\stackrel{+}{C}=O, H_2 N \stackrel{+}{:}, \stackrel{+}{N} O_2
\end{aligned}
$
→
Write the formulae of:
  1. Albite.
  2. Chile salt petre.
  3. Glauber's salt.
  4. Borax.
→
  1. Complete the following reactions:
  1. $8\text{BF}_3+6\text{LiH}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\ ........$
  2. $\text{H}_3\text{BO}_3\xrightarrow{\ \ \ \Delta\ \ \ }\ .........$
  3. $2\text{Al}+6\text{HCl}\xrightarrow{\ \ \ \ \ \ \ \ }\ .........$
  1. What are fullerenes? How are they prepared?
→
A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0L (measured at STP) of this welding gas is found to weigh 11.6g. Calculate.
  1. Empirical formula.
  2. Molar mass of the gas.
  3. Molecular formula.
→
i. A vessel of $1.00 dm ^3$ capacity contains $16.00$ g of oxygen and $8.00$ g of hydrogen at $17^{\circ} C$. Calculate the partial
ii. According to kinetic molecular theory, explain why gases exert pressure?
iii. How is isotherm at critical temperature of a gas different from those at lower temperatures?
→
What are quantum numbers? Discuss this in detail.
→