Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: Precipitation reaction  (Read 175 times)

0 Members and 1 Guest are viewing this topic.

kdbmvp

  • New Member
  • **
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 5
Precipitation reaction
« on: February 13, 2019, 11:05:59 PM »

Hello,

I have a question regarding precipitation reactions. Consider the following rx:

Pb(NO3)2 + 2NaOH -> Pb(OH)2+ 2Na+ + 2NO3-

My question is: Why doesn't the 2Na+ cations react with the 2NO- anions, but remain spectator ions?
« Last Edit: February 13, 2019, 11:23:24 PM by kdbmvp »
Logged

chenbeier

  • Full Member
  • ****
  • Mole Snacks: +42/-13
  • Offline Offline
  • Gender: Male
  • Posts: 400
Re: Precipitation reaction
« Reply #1 on: February 13, 2019, 11:15:18 PM »

First there will be no NO-.

If you dissolve Pb(NO3)2 and NaOH seperatly in one beaker glass then you get Pb2+ and 2 NO3- and in the other glass Na+ and OH-.

If you now mix both solution the lead hydroxide Pb(OH)2will precipitate . The Na+ and NO3- will be still dissolved in the solution. There for we call them spectator ions.
Logged

kdbmvp

  • New Member
  • **
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 5
Re: Precipitation reaction
« Reply #2 on: February 13, 2019, 11:23:02 PM »

Sorry about that, writing mistake. Meant NO3-. But why doesn't Na+ and NO3- react? What determines this?
Logged

chenbeier

  • Full Member
  • ****
  • Mole Snacks: +42/-13
  • Offline Offline
  • Gender: Male
  • Posts: 400
Re: Precipitation reaction
« Reply #3 on: February 13, 2019, 11:31:52 PM »

They still swimming in the solution. Sodium nitrate is good solouble. If you evaporate the water you will get NaNO3.

I tis the same you dissolve NaCl. You get Na+ and Cl-. You get the salt back, if the water is removed.
Logged

kdbmvp

  • New Member
  • **
  • Mole Snacks: +0/-0
  • Offline Offline
  • Posts: 5
Re: Precipitation reaction
« Reply #4 on: February 13, 2019, 11:57:10 PM »

Thank you!
Logged
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.066 seconds with 24 queries.