Question
What is simple buffer? Give an example and also explain its mechanism.
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Answer
SELF
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Similar questions
Draw the Lewis structures for the following molecules and ions:
$\text{H}_2\text{S},\ \text{SiCl}_4,\ \text{BeF}_2,\ \text{CO}^{2-}_3,\ \ \text{HCOOH}$
→$\text{H}_2\text{S},\ \text{SiCl}_4,\ \text{BeF}_2,\ \text{CO}^{2-}_3,\ \ \text{HCOOH}$
The reaction of cyanamide, NH2CN(s), with dioxygen was carried out in a bomb calorimeter, and $\Delta\text{U} $ was found to be –742.7kJ mol–1 at 298K. Calculate enthalpy change for the reaction at 298K.
→$\text{NH}_2\text{CN}(\text{g}) +\frac{3}{2}\text{O}_2 (\text{g})\xrightarrow{ \ \ \ \ \ \ } \text{N}_2(\text{g}) + \text{CO}_2(\text{g}) + \text{H}_2\text{O}(\text{l})$
1. Give IUPAC names of the following structures.
2. Benzoic acid is an organic compound. Its crude sample can be purified by crystallization from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?
2. Benzoic acid is an organic compound. Its crude sample can be purified by crystallization from hot water. What characteristic differences in the properties of benzoic acid and the impurity make this process of purification suitable?
- At 473K, equilibrium constant, K for decomposition of PCl5 is 8.3 × 10-3. If decomposition is depicted as
$\text{PCl}_5(\text{s})\rightleftharpoons\text{PCl}_3(\text{s})+\text{Cl}_2(\text{g});$
$\Delta_\text{r}\text{H}^\text{o}=124.0\text{kJ mol}^{-1}$
- Write an expression for Kc for the reaction.
- What is the value of Kc for the reverse reaction at same temperature.
- What would be the effect on Kc if:
- The pressure is increased?
- The temperature is increased?
- Write equilibrium constant for the following reactions:
-
$\text{BaCO}_3(\text{s})\rightleftharpoons\text{BaO(s)}+\text{CO}_2(\text{g})$
-
$\text{CH}_4(\text{g})+2\text{O}_2(\text{g})\rightleftharpoons\text{CO}_2(\text{g})+2\text{H}_2\text{O(g)}$
Four moles of PCl5 are heated in a closed 4dm3(L) container to reach equilibrium at 400K. At equilibrium 50% of PCl5 is dissociated. What is the value of Kc for the dissociation of PCl5 into PCl3 and Cl2 at 400K.
Dihydrogen gas used in Haber’s process is produced by reacting methane from natural gas with high temperature steam. The first stage of two stage reaction involves the formation of CO and H2. In second stage, CO formed in first stage is reacted with more steam in water gas shift reaction,
$\text{CO (g) + H}_2\text{O (g)}\rightleftharpoons\text{CO}_2\text{ (g) + H}_2\text{ (g)}$
If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that $\text{p}_\text{co}=\text{p}_{\text{H}_2\text{O}}=4.0$bar, what will be the partial pressure of H2 at equilibrium?$\text{K}_\text{p}=10.1\text{ at }400^\circ\text{C}$
→$\text{CO (g) + H}_2\text{O (g)}\rightleftharpoons\text{CO}_2\text{ (g) + H}_2\text{ (g)}$
If a reaction vessel at 400°C is charged with an equimolar mixture of CO and steam such that $\text{p}_\text{co}=\text{p}_{\text{H}_2\text{O}}=4.0$bar, what will be the partial pressure of H2 at equilibrium?$\text{K}_\text{p}=10.1\text{ at }400^\circ\text{C}$
Discuss the shape of the following molecules using the VSEPR model:
$BeCl _2, BCl _3, SiCl _4, AsF _5, H _2 S, PH _3$
→$BeCl _2, BCl _3, SiCl _4, AsF _5, H _2 S, PH _3$
Sodium carbonate, Na2CO3 can be obtained by heating sodium hydrogen carbonate, NaHCO3 as 2NaHCO3(s) → Na2CO3(s) + H2O(g) + CO2(g).
The essential data are,
Calculate the temperature above which NaHCO3 decomposes to give products at 1 bar.
→The essential data are,
| | NaHCO3(s) | Na2CO3(s) | CO2(g) | H2O(g) |
| $\ \ \ \ \Delta_\text{f}\text{H}^\circ\$\text{kJ mol}^{-1})$ | -947.7 | -1130.9 | -393.51 | -241.82 |
| $\ \ \ \ \ \text{S}^\circ_\text{m}\$\text{J mol}^{-1})$ | 102.1 | 136 | 188.83 | 213.74 |
- In qualitative analysis, on what basis cations are grouped?
- The value of Kc in the reaction:
$2\text{A}\rightleftharpoons\text{B}+\text{C}$ is 2 × 10-3. At a given time, the composition of reaction mixture is [A] = [B] = [C] = 3 × 10-4M. In which direction the reaction will proceed?
- The solubility of Sr(OH)2 at 298K is 19.23g/L of solution. Calculate the concentration of strontium and hydroxyl ions and the pH of the solution.
Chlorine is prepared in the laboratory by treating manganese dioxide (MnO2) with aqueous hydrochloric acid according to the reaction
4HCl(aq) + MnO2(s) → 2H2O(l) + MnCl2(aq) + Cl2(g)
How many grams of HCl react with 5.0g of manganese dioxide?
4HCl(aq) + MnO2(s) → 2H2O(l) + MnCl2(aq) + Cl2(g)
How many grams of HCl react with 5.0g of manganese dioxide?