Testes de Precipitato e Litmus

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Questions and Answers

Cu2+ ppt se forma quando in presencia de?

  • Silver nitrate
  • Sodium hydroxide (correct)
  • Barium chloride
  • Potassium iodide

Fe2+ forma un precipitate de quale color quando in contacto con sodio hydroxide?

  • Blue
  • Brown
  • Green (correct)
  • Yellow

Quale precipitate forma Fe3+ when addes sodio hydroxide?

  • Brown (correct)
  • Blue
  • Green
  • White

Le precipitate bright yellow se forma con Pb2+ e quale reagen?

<p>Potassium iodide (D)</p> Signup and view all the answers

Le precipitate white se forma quando Cl- interacte con quale reagen?

<p>Silver nitrate (C)</p> Signup and view all the answers

Le precipitate cream se genera quando Br- es addite a quale reagen?

<p>Silver nitrate (A)</p> Signup and view all the answers

Le precipitate pale yellow se forma con I- e quale reagen?

<p>Silver nitrate (A)</p> Signup and view all the answers

Le ion SO4 2- resulta in un precipitate white quando in presenza de quale reagen?

<p>Barium chloride (C)</p> Signup and view all the answers

Zn2+ produce qual color de precipitate in exceso de sodio hydroxide?

<p>Colourless</p> Signup and view all the answers

Al3+ ante un excess de sodio hydroxide resultara in qual effetto?

<p>Colourless</p> Signup and view all the answers

Ag+ resulta in un precipitate de quale color quando interacte con sodio hydroxide?

<p>Brown (A)</p> Signup and view all the answers

Le precipitate white se forma con Ca2+ e quale reagen?

<p>Sodium hydroxide (C)</p> Signup and view all the answers

OH- turn litmus paper blue.

<p>True (A)</p> Signup and view all the answers

NH4+ turn red litmus paper blue when in contact with sodium hydroxide.

<p>True (A)</p> Signup and view all the answers

CO3 2- turn limewater cloudy when react with _____

<p>hydrochloric acid</p> Signup and view all the answers

NO3- can turn red litmus paper blue when treated with sodium hydroxide and Devarda's alloy.

<p>True (A)</p> Signup and view all the answers

Na+ produce qual color de flamma?

<p>Yellow (C)</p> Signup and view all the answers

Li+ resulta in qual flamma?

<p>Bright red (C)</p> Signup and view all the answers

K+ produce qual color de flamma?

<p>Lilac (C)</p> Signup and view all the answers

Ca2+ produce qual flamma color?

<p>Brick red (A)</p> Signup and view all the answers

Ba2+ produce qual color de flamma?

<p>Apple green (B)</p> Signup and view all the answers

Cu2+ produce qual color de flamma?

<p>Blue green (C)</p> Signup and view all the answers

V (+5) produce qual color?

<p>Yellow (D)</p> Signup and view all the answers

V (+4) resulta in qual color?

<p>Blue (D)</p> Signup and view all the answers

V (+3) resulta in qual color?

<p>Green (B)</p> Signup and view all the answers

V (+2) resulta in qual colar?

<p>Violet (D)</p> Signup and view all the answers

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Study Notes

Testes de Precipitato

  • Cu²⁺:

    • Hydroxido de sodio causa un precipitato blue.
  • Fe²⁺:

    • Hydroxido de sodio causa un precipitato verde.
  • Fe³⁺:

    • Hydroxido de sodio causa un precipitato marrone.
  • Pb²⁺:

    • Ioduro de potassio produce un precipitato jaune brillante.
  • Cl⁻:

    • Nitrato de argento forma un precipitato branco.
  • Br⁻:

    • Nitrato de argento causa un precipitato de crema.
  • I⁻:

    • Nitrato de argento forma un precipitato pale jaune.
  • SO₄²⁻:

    • Chloruro de bario produce un precipitato branco.
  • Zn²⁺:

    • Plus de hydroxido de sodio produce un solution colorless.
  • Al³⁺:

    • Plus de hydroxido de sodio resulta in un solution colorless.
  • Ag⁺:

    • Hydroxido de sodio produce un precipitato marrone.
  • Ca²⁺:

    • Hydroxido de sodio produce un precipitato branco.

Litmus Testes e Indicatores

  • OH⁻:

    • Litmus paper deveni blue.
  • NH₄⁺:

    • Hydroxido de sodio cambia litmus paper red a blue.
  • CO₃²⁻:

    • Acido chlorhydric crea turbido in aqua de calce.
  • NO₃⁻:

    • Hydroxido de sodio e alloy de Devarda cambia litmus paper red a blue.

Flamo Testes

  • Na⁺:

    • Produce un flamo jaune.
  • Li⁺:

    • Produce un flamo bright red.
  • K⁺:

    • Produce un flamo lilac.
  • Ca²⁺:

    • Produce un flamo brick red.
  • Ba²⁺:

    • Produce un flamo verde de pommo.
  • Cu²⁺:

    • Produce un flamo blue green.

Stati de Vanadio

  • V (+5):

    • Presenta un color jaune.
  • V (+4):

    • Presenta un color blue.
  • V (+3):

    • Presenta un color verde.
  • V (+2):

    • Presenta un color violet.

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