Most popular questions and responses by melbell
  1. Chemistry

    The concentration of a certain sodium hydroxide solution was determined by using the solution to titrate a sample of potassium hydrogen phthalate (abbreviated KHP). KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration

    asked on October 7, 2014
  2. Chemistry

    A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 mL of 0.100 M hydrochloric acid, 100.0 mL of 0.200 M of nintric acid,500. mL of 0.0100 M calcium hydroxide, and 200.0 mL

    asked on October 7, 2014
  3. Chemistry

    In chemistry, we did a lab in which we had a certain mass of copper, performed multiple experiments on the copper, and at the end, extracted the copper from a solution and weighed it. The goal was that the mass of the final copper should be the same as the

    asked on October 5, 2014
  4. Chemistry Lab MgO

    If in Part B.2, the burning of the magnesium is uncontrolled (burns brightly), how will this procedural error affect the reported mass of: a Magnesium in the magnesium oxide? Explain. B. oxygen in the magnesium oxide? Explain.

    asked on September 21, 2014
  5. Chemistry - Titrations

    What volume (mL) of 0.2650 N H3PO4 is required to neutralize: a) 35.25 mL of 0.2300 M KOH b) 19.14 mL of 0.2300 M NH4OH Unfortunately, the teacher didn't get the opportunity to teach us titrations in class today, but this problem (and more) are still due

    asked on September 29, 2014
  1. Science

    You've gotten the moles of CO2 and H20, but now you must find the only the moles of Carbon and Hydrogen. Originally, the compound that was combusted only contained C and H. Therefore, all the C in the compound went into CO2 and all the H went into H2O. To

    posted on August 19, 2015
  2. Math

    The only removable one is a point discontinuity, in which a single point on the graph is missing. The other two discontinuities, jump and infinite, are nonremovable. A jump discontinuity is when the graph "jumps" in y-value and does not connect, while an

    posted on August 19, 2015
  3. chemistry

    Multiply 23 grams of zirconium by the molar mass of zirconium, and then by Avogadro's number (6.022x10^23) to get the number of atoms in 23 grams of zirconium. Then, since we had the grams of zirconium and converted it into atoms of zirconium, we are going

    posted on November 23, 2014
  4. Chemistry

    Thank you so much! this is a lot easier than the way I was originally trying to solve it

    posted on October 8, 2014
  5. Chemistry

    Thank you Dr. Bob

    posted on October 8, 2014
  6. Chemistry

    Great thanks! And I looked up the melting point of copper and it's 1085 degrees Celsius and it sure isn't getting that hot haha so it would make sense that 100 degrees Celsius is the maximum temperature.

    posted on October 5, 2014
  7. Chemistry - Titrations

    Yes, thank you very much!! and for part b I ended up getting 16.61 mL. Thank you for your help

    posted on September 29, 2014
  8. Chemistry - Titrations

    Unfortunately, that's all the information I have. The point of doing these problems on the site called "CalmWeb" is so that we can't look up the answers in the back of the book, because we only know we have the answer correct once we type it in, so sorry

    posted on September 29, 2014
  9. Chemistry Lab MgO

    Ok, I think I get it now. Thank you so much!

    posted on September 21, 2014
  10. General Chemistry

    if the burning of magnesium is complete, is seems that that is not a procedural error. after completion the mass of magnesium should be the same and now you have increased mass of magnesium oxide because before you had none

    posted on September 21, 2014