Chemistry Lab

Are you titrating? Qualitative testing? Just what? If the copper is in solution you can filter the ppt (or let the ppt settle and decant some of the supernatant liquid) and to the filtrate or the decanted liquid add some more NaOH to see if additional ppt will form. If I have guessed wrong about the application just clarify what you're doing and repost.

The lab pertains to the copper cycle. The reaction is copper nitrate (aq) + 2NaOH (aq) -> copper hydroxide (solid) + 2 sodium nitrate (aq)

If I had not added enough NaOH, I know I wouldn't be getting enough precipitate, but I'm not sure I would be able to tell just by looking at it. The copper nitrate itself is a light blue color and the end result should be dark blue with precipitate, but there is still some surrounding light blue solution

  1. 👍 0
  2. 👎 0
  3. 👁 113
asked by Joe
  1. If there is a pale blue color to the liquid, I would be skeptical that all of the copper hydroxide had been pptd. You can do one of two things. (Of course, some of the ppt may be very finely divided, hasn't settled, and that could be providing the color.) One is to let the ppt settle for a period of time. Then add, dropwise and without stirring, NaOH to the liquid above the ppt. Observe closely if a ppt forms when the drops of NaOH make contact with the solution. The other way is to just add an excess of NaOH so you KNOW all of the hydroxide has pptd.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. chemistry

    the experiment is a sequence of Chemical Reactions. Procedure part A preparation fo copper (II) Hydroxide-get a solution of copper(II)nitrate. measure 25ml of solution. to blue solution add 2mL of concertarted NaOH while stirring.

    asked by Missy on September 15, 2010
  2. Chemistry

    he experiment is a sequence of Chemical Reactions. Procedure part A preparation fo copper (II) Hydroxide-get a solution of copper(II)nitrate. measure 25ml of solution. to blue solution add 2mL of concertarted NaOH while stirring.

    asked by Missy For Bob on September 15, 2010
  3. Ions & Atoms-Lab Part 1

    We did a lab on Ions and Atoms. The purpose was basically to identify the properties of an ion and compare them to atoms. These were the Materials -safety goggles -apron -copper(II) chloride (CuCl2) -3 250-ml beakers -water

    asked by Sara on April 19, 2010
  4. Chemistry

    In a laboratory, a student studies the absorption and transmission of light in order to analyze copper in brass and determine its percentage within the brass sample. He determines the amount of light absorbed by a sample by

    asked by Jessica on April 1, 2009
  5. science(chem)

    [b]1.[/b]Is TLC a qualitative or quantitative analysis? Is there any way that it can be both? Explain. ~I say it can be both since it can be used to go and determine what exactly is in a sample of mixed compounds which would be

    asked by ~christina~ on October 13, 2007
  6. science

    PSD of noise and desired signal is required to design Derivative-based filter Butterworth filter Wiener filter Notch filter

    asked by jegadeeshwari on January 31, 2018
  7. Stats

    1.Number of people in attendance at a baseball game qualitative/ordinal qualitative/nominal quantitative/discrete quantitative/continuous 2. number of tracks on a CD qualitative/ordinal qualitative/nominal quantitative/discrete

    asked by Kathryn on August 11, 2014
  8. Chemistry

    An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper? Trying to

    asked by Mom on October 9, 2011
  9. Chemistry

    An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper? Trying to

    asked by Mom on October 9, 2011
  10. Chemistry

    An aqueous solution of copper (I) chloride is 15.7% by mass copper (I) chloride. Copper (I) is 35.8% by mass chlorine. If the solution has a density of 1.045 g/cm³, how many gallons of solution contain 2.3 kg of copper? Trying to

    asked by Mom on October 8, 2011

More Similar Questions