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Chapter 6: Q45 P (page 143)

: Write thereaction for pyridine and for sodium 2-mercaptoethanol.

Short Answer

Expert verified

The reaction for pyridine is written as

The $k_{b}$ reaction for sodium 2-mercaptoethanol is written as

$H O C H_{2} S - N a^{+} + H_{2} O ⇌ H O C H_{2} C H_{2} S H + N a O H$

Step by step solution

01

Define base dissolution constant

The base dissociation constant ( $k_{b}$ ) is a metric for basicity, or the strength of the base in general.

02

Write the kb reaction

The base dissociation constant $k_{b}$ comes when base is reacted with weak acid such as water that gives weak acid.

The $k_{b}$ reaction for pyridine is,

The reaction $k_{b}$ for sodium 2-mercaptoethanol is,

$H O C H_{2} S^{-} N a^{+} + H_{2} O ⇌ H O C H_{2} C H_{2} S H + N a O H$

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Most popular questions from this chapter

For the reaction ${HCO}_{3}^{-} ⇌ H^{+} + " {CO}_{3}^{2 -}$ , $ΔG ° = + 59.0 kJ / mol$ at $298.15 K$ . Find the value of Kfor the reaction.

Write the $K_{b}$ reaction for pyridine and for sodium 2-mercaptoethanol.

Find $[{Cu}^{2 +}]$ in a solution saturated with ${Cu}_{4} {(OH)}_{6} ({so}_{4})$ if $[{OH}^{-}]$ is fixed at $1.0 \times 10^{- 6} M$ . Note that ${Cu}_{4} {(OH)}_{6} ({so}_{4})$ gives 1mol of ${SO}_{4}^{2 -}$ 4 mol for of ${Cu}^{2 +}$ .

${Cu}_{4} {(OH)}_{6} ({so}_{4}) (s) ⇋ 4 C u^{2 +} + 6 O H^{-} + S O_{4}^{2 -} K_{s p} = 2.3 \times 10^{- 69}$

The equilibrium constant for the reaction of ${NH}_{3} (aq) + H_{2} O ⇌ {NH}_{4}^{+} + {OH}^{-}$ is $K_{b} = 1.479 \times 10^{- 5}$ at $5 ° C$ and $1.570 \times 10^{- 5}$ at $10 ° C$ .

(a) Assuming $∆ H °$ and $∆ S °$ are constant in the interval $5 ° - 10 ° C$ (probably a good assumption for small $∆ T$ ), use Equation 6-9 to find $∆ H °$ for the reaction in this temperature range.

(b) Describe how Equation 6-9 could be used to make a linear graph to determine $∆ H °$ , if $∆ H °$ and $∆ S °$ were constant over some temperature range

Find $[{Pb}^{2 +}], {PbI}_{2} (aq),$ and $[{PbI}_{3}^{-}]$ in a saturated solution of ${PbI}_{2} (s)$ with $[I^{-}] = 0.10 M .$

See all solutions

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