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31 Cards in this Set
- Front
- Back
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What is titration?
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A technique where a solution of a known concentration is used to determine the concentration of an unknown solution.
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What is neutralization?
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A reaction where a strong acid and a strong base react to form water and an ionic salt.
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What is the end point?
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The point where an excess of the titrating reagent becomes visible |
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What is the equivalence point?
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The point in a reaction where the acid=base |
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What is molarity?
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The concentration of moles per liter of a substance |
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What is an indicator?
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A substance added to a reaction to cause a visible color change when the reaction reaches a specific threshold of presence or absence of a substance |
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What is MaVa = MbVb
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The dilution reaction, where the moles of the acid x volume of the acid = moles of the base x volume of base |
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In the titration lab, what solution did the buret contain? Is it a known or unknown? Does it contain an indicator? |
NaOH Known No |
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In the titration lab, what solution did the erlymer flask contain? Is it a known or unknown? Does it contain an indicator? |
Unknown Yes |
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Can you use a titration procedure to find the molar concentration of two unknown solutions? Why or why not?
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No, you need to know the 3 out of the 4 variables to be able to use the dilution equation.
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What is pH?
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A figure expressing the acidity or alkalinity of a substance on a logarithmic scale |
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What is pH scale?
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The logarithmic scale of acidity where 1-6= acidic, 7= neutral, and 8-14= basic |
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What is a hydronium ion?
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H30^+; the cation product of dissociation of an acid into a solution |
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What is a hydroxide ion?
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OH^-; the anion product of dissociation of a base into a solution
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How do you use the pH= -log[H30+]?
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You use the [H+] to determine the pH by taking the log of the [H+], which should be an exponent #.
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How do you use [H30+] = 10^-pH?
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You use the pH to determine the [H+] by taking 2nd log od the negative pH, which should be a whole number.
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How do you use pOH= -log [OH-]?
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You use the [OH-] to determine the pOH by taking the log of the [OH-], which should be an exponent number.
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How do you use [H30+][OH-]= 1X10^-14
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How do you use pH + pOH= 14
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Subtract either pH/pOH from 14 to determine the other value |
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A buffer solution does WHAT to the original pH?
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A buffer solution closely maintains it's original pH |
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What is a buffer solution?
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A buffer solution consists of a weak acid and the salt of the weak acid or a weak base and the salt of the weak base. The function of a buffer solution of a buffer solution is to maintain the pH when small amounts of an acid or base are added. |
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What is a weak acid or weak base?
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An acid or base that does not completely ionize in water, therefore the concentration of [H+] or [OH-] ions will always be less than the molarity of the acid/base. |
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What is a salt of a weak acid (conjugate base)?
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salt of a weak acid makes a base solution |
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What is a salt of a weak base (conjugate acid)?
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salt of a weak base makes an acidic solution |
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Sig Fig Rules (4)
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-Zero's between are significant -Zero's to the left are not significant -Zero's to the right are significant -Zero's to the left of the decimal point are only significant if there is a decimal point. |
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What is the sig fig rule for mult/div?
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Least total sig figs |
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What is the sig fig rule for add/subtract?
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least sig fig behind decimal point |
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What is accuracy?
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The agreement between your measured value and the true or accepted value
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What is precision?
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A measure of how carefully a measurement is made. It is not related to accuracy. |
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Percent error equation?
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(theoretical-experimental/theoretical) x 100 |
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