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    Questions & Answer of Molarity & Normality

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    Talib Al_Munawri
    Director-General
    Director-General

    Posts: 333
    Join date: 2009-07-03
    Age: 27
    Location: Sultanate of Oman

    Questions & Answer of Molarity & Normality

    Post by Talib Al_Munawri on Fri Dec 04, 2009 8:36 pm

    What is the Normality of a solution?

    Normality = Molarity x Number of equivalents per mole for the molecule


    What is the Molarity of solution?

    No of moles
    Molarity = -----------------------
    1L of solution


    How we can find No of moles?

    No of grams
    No of moles = --------------------------
    Molecular weight


    What is meant by Stoichiometry?

    The quantitative relationship among reactants and products.

    What is the basic law of nature?

    Number and kinds of atoms before and after the reactions are always the same.

    What is the limiting reactant?

    The reactant that is completely consumed.

    What is the excess reactant?

    Unreacted reactants

    What is meant by yields?

    amounts of substances produced

    What is meant by theoretical yields?

    The amounts calculated according to Stoichiometry.

    What is meant by chemical reactions?

    Changes when one or more substances convert to other substance.

    List types of chemicals reactions?

    Combination reaction
    Exchange reaction
    Combustion reaction
    Displacement reaction

    Write three equations express equilibrium?

    2NO2 = N2O4
    3H2 + N2 = 2NH3
    H2O + CO = H2 + CO2


    What is meant by closed system?

    No energy or mass transferred into or out of the system

    What are the most common types of measurements?

    Gravimetric ( weighing )
    Electrochemical ( using meters with electrodes)
    Optical ( including visual)

    What is separation techniques include?

    Filtration
    Distillation
    Extraction

    Often the sample is made acidic or alkaline or treated chemically in some other way before distillation. Why?

    To convert the analyte into a volatile form and to immobilize or neutralize interfering substances.

    What is meant by ''liquid-liquid'' extraction?

    If the solvent does not mix with water, and the sample is shaken
    with portions of the solvent, almost all of the analyte may be
    transferred from the water into the solvent, leaving interfering
    substances behind.

    What is meant by '' solid-phase extraction''?

    the sample is passed through a column or filter containing
    a powdered or granulated material which retain adsorbs the
    substances of interest and allows other types of dissolved
    materials to pass through. Then a solvent, or an acid or alkaline
    solution, can be passed through the de-sorb and redissolve the
    analytes.

    What is meant by elution?

    the sample is passed through a column or filter containing
    a powdered or granulated material which retain adsorbs the
    substances of interest and allows other types of dissolved
    materials to pass through. Then a solvent, or an acid or alkaline
    solution, can be passed through the de-sorb and redissolve the
    analytes.

    Why we use the type extraction?

    to concentrate the analyte into a smaller total volume,
    which increase the sensitivity of the analysis.


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