Advertisements
Advertisements
प्रश्न
The pKa value of HCl is −7.0 and that of HI is −10.0. Which is the stronger acid?
Advertisements
उत्तर
pKa is the negative logarithm of the acid dissociation constant (Ka):
pKa = −log10(Ka)
Lower pKa ⇒ higher Ka ⇒ stronger acid
pKa of HCl = −7.0
pKa of HI = −10.0
Since −10 < −7, HI has a lower pKa, so it has a higher Ka.
The smaller the pKa value, the greater its acidity. Hence, HI is a stronger acid than HCl.
APPEARS IN
संबंधित प्रश्न
Select appropriate answers for the following.
Stability of interhalogen compounds follows the order _______.
Answer the following.
What is the action of bromine on magnesium metal?
Write the names of allotropic forms of selenium.
Complete the following.
Cl2 + ClF3 → _______
Complete the following.
\[\ce{XeF4 + SiO2 -> {..........} + SiF4}\]
Complete the following.
\[\ce{XeF6 + 6H2O -> \underline{}\underline{}\underline{}\underline{} + HF}\]
Complete the following.
\[\ce{XeOF4 + H2O -> \underline{}\underline{}\underline{}\underline{} + HF}\]
Match the following:
| A | B |
| XeOF2 | Xenon trioxydifluoride |
| XeO2F2 | Xenon monooxydifluoride |
| XeO3F2 | Xenon dioxytetrafluoride |
| XeO2F4 | Xenon dioxydifluoride |
Answer the following.
Distinguish between rhombic sulfur and monoclinic sulfur.
How is SO2 prepared in the laboratory from sodium sulfite?
Describe the manufacturing of H2SO4 by the contact process.
Acidic strength of halogen acids increases in the order of _______.
What is the highest oxidation state possessed by phosphorus in it's oxyacids?
What is the highest oxidation state possessed by phosphorus in it's oxyacids?
Which of the following statements are TRUE?
Which of the following oxyacid of chlorine has highest thermal stability?
Which of the following oxyacid of chlorine is thermally least stable?
Which among the following gases is used to produce and sustain powerful super conducting magnets for NMR and MRI systems?
What is the highest oxidation state possessed by chlorine in its oxyacids?
What is the action of selenium on magnesium metal?
Which halide of magnesium has highest ionic character?
What is the oxidation number of gold in the complex [AuCl4]1−?
In which substance does nitrogen exhibit the lowest oxidation state?
What are the allotropes of oxygen?
Give two reactions in which acidified K2Cr2O7 is used as an oxidizing agent.
What is the action of hydrochloric acid on the following?
NH3
What is the action metal on elements of group 17?
Arrange the following in the increasing order of the property mentioned:
\[\ce{HF}\], \[\ce{HCl}\], \[\ce{HBr}\], \[\ce{HI}\] (thermal stability)
