Titration Lab Introduction The purpose of this lab is reach and be able to calculate the equivalence point when we use titration to neutralize a base with acid. The process of the lab was determining the volume of a solution needed to react with a given mass or volume of a sample is called titration. The equivalence point is when the same number of moles of acid and moles of base has been added. Phenolphthalein is used as an indicator because it will have a color change when the equivalence point has been reached.
Procedure See AP Chemistry.
Chapter 4, Acid-Base Reactions, Titration Lab for procedure, or see worksheet. Data Standardization of Base with Solid Acid | PART I| Solid Acid| Base (NaOH)| Ratio: volume base/ mass acid| Final mass or volume| . 70g| 38 ml| 38 ml / . 70g | Initial mass of volume| . 70g| 0. 0 ml| | Mass or volume| . 70g | 38 ml | | Titration of HCL | PART II| Acid (HCL)| Base (NaOH) | Ratio: volume base/ volume acid| Final volume| 10 ml| 4.
8 ml| 4. 8ml / 10ml| Initial volume| 0. 0 ml| 0. 0 ml| | Volume| 10 ml| 4. 8 ml| | Calculations Part I Solid Acid- KHC4H4O6- 188g – . 0037mol Base- NaOH . 38 L 1 KHC4H4O6 + 1 NaOH > H2O + NaKC4H4O6 .0037mol KHC4H4O6 *1 mol NaOH/ 1 mol KHC4H4O6 = . 0037 mol NaOH= MnaOH = . 0037 mol/ . 038 L = . 0974 MnaOH Calculations Part II M a * V a = M b* V b M a * . 010 L = . 9074 M * . 0048 L (. 0974 M * . 0048 L) / . 010 L = . 047 M a = . 047 M of HCL Conclusion The Purpose of this lab was to find the equivalence point of a titration of an acid and base. We were able to find that the concentration of NaOH that was needed to neutralize our solid acid was . 0974M and that a concentration of HCL . 047M was needed to neutralize. 0974 M NaOH.
We were able to calculate this with the equation of M acid * V acid = M base * M base. The same lab was done by www. chemicalforums. com and found that they needed . 077M of HL was needed to neutralize their NaOH. There is doubt in both of our experiments because the value we should have got is . 050 M HCL. The doubt we have just means that we had error in lab. Our calculations were not completely off, just over and under by a little. What we should have got was . 050 M HCL, which is the theoretical value. To calculate just how far off we were we have to do percent error.
To do this we take the theatrical subtract out actual and divide by the theoretical. (. 050 – . 047)/ . 050 * 100 = 6% Sources of error might have come from the lack of precision when measuring during lab If the measurements were right on we probably would have got more actuate results of M HCL. We can see this by X representing M HCl. (. 050 – . 047<X<. 050) / . 050 * 100. That would make sense because X would then have to be greater than what we got before (. 047) but not greater t than the theoretical. This would make the percent error closer to none.
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