CHEMISTRY PROJECT

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CHEMISTRY PROJECT

• LI HIN HANG
• CHUI HIU TUNG

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CHEMISTRY PRACTICAL PROJECT WORK

• DETERMINE THE NEURALIZING POWER OF COMMERICAL
• ANTACID SAMPLES

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THEORY

• ANTI ACID IS A KIND OF MEDICINE THAT USED TO CURE
  STOMACH ACHE
• IN THIS EXPERIMENT ,WE WILL PUT THE ANTI ACID IN
  KNOWN MOLARITY (O.1M)HCl AND IS BACK TITRATED
  AGAINST STANDARD NaOH SOLUTION.

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• WE CAN DETERMINE THE NEUTRALIZING POWER OF EACH
  BRAND OF SAMPLE BY RECORDING THE VOLUME OF NaOH
  USED IN BACK TITRATION
• THE ONE WHICH USE LESS NaOH IN BACK TITRATION
  MEANS THAT IS THE STRONGER

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CHEMICALS AND SAMPLES USED

• 0.1M HCl 300ml
• 0.1M NaOH 300ml
• CARBON POWDER
• MTHYL ORANGE
• 1 TABLET OF EACH SAMPLE

• WEISEN U
• TAITAN
• HYDROSOIL

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APPARATUS AND EQUIPMENT USED

• 500ml BEAKER X1
• 250ml BEARKER X3
• 250ml CONICAL FLASK X3
• 25ml PIPETTE X1
• PIPETTE FILLER X1
• 50ml BURETTE X2
• BURETTE CLAMP X 2

• FUNNEL X1
• FILTER PAPER X3
• GLASS ROD X1
• DROPPER X1
• WASH BOTTLE X1
• WHITE TILE X1
• ELECTRIC BALANCE X1

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• MORTAR AND PESTLE X1
• SPOON X1

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EXPRERIMENTAL PROCEDURES

• STANDARDIZATION OF HCl
• BACK TITRATION OF EACH SAMPLE

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STANDARDIZATION OF HCl

• TO DETERMINE THE MOLARITY OF HCl

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PROCEDURES

• CLEAN UP ALL APPARATUS
• SUCK UP 25ml OF HCl (UNKNOWN MOLARITY)INTO THE
  PIPETTE BY USING PIPETTE FILLER
• RELEASE THE SOLUTION INTO 250ml CONICAL FLASK
• ADDING SOME INDICATOR(MTHYL ORANGE) TO THE
  CONCIAL FLASK

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• ADD UP THE BURETTE WITH 50mlOF (0.1M)NaOH
• TITRATE THE SOLUTION UNTIL IT REACH THE END
  POINT.(INDICATE CHANGE OF RED TO YELLOW)

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RESULT
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BACK TITRATION OF EACH SAMPLE

• TO DETERMINE THE NUTRALIZING POWER OF EACH SAMPLE

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PROCEDURES

• USE MOTER AND PISTEL TO BREAK DOWN THE TABLET
  INTO POWDER FORM
• WEIGHT THE POWDER BY ELECTRIC BALANCE
• DISSOLVE THE POWDER IN EXCESS HCl(25ml,30ml OR
  50ml) IN CONCIAL FLASK(250ml)

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• STIRR THE SOLUTION WITH GLASS ROD
• ADDING SOME CARBON POWDER TO ABSORB THE COLOUR OF
  THE SOLUTION
• USE THE FILTER PAPER AND FUNNEL TO FILTER OUT THE
  UNDISSOLVE PARTICALS AND CARBON POWDER

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• ADDING FEW DROPS OF MTHYL ORANGE TO THE FILTERED
  SOLUTION AS AN INDICATOR
• ADD UP THE BURETTE WITH 50ml NaOH(0.1M)
• TITRATE THE SOLUTION UNTIL IT REACH THE END
  POINT(RED TO YELLOW)

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ACTIVE INGREDIENT OF WEISEN U

• ALUMINIUM HYDROXIDE 192mg
• MAGNESIUM HYDROXIDE 159mg
• METHYLMETHIONINE SULFONIUM CHLORIDE 25mg
• BIODIASTASE 25mg

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RESULT OF WEISEN U
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NO. OF MOLE OF HCl NEUTRALIZED BY WEISENU
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INGRADIENTS OF TAITAN

• Na(HCO3) 91.7mg
• Al(OH)3 36.7mg
• Al(OH)3Mg(OH)2 36.7mg
• OTHERS 41.8mg

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RESULT OF TAITAN
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INGREDIENTS OF HYDROSOIL

• Al(OH)3 200mg
• Mg(OH)2 200mg
• OTHERS 150mg

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RESULT OF HYDROSOIL
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NO. OF MOLE OF HCl NEUTRALIZED BY EACH SAMPLE

• WEISEN U(2.559/1000)mol
• TAITAN(2.12/1000)mol
• HYDROSOIL(1.24/1000)mol

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ERRORS OF THE EXPERIMENT

• THERE WILL HAVE SOME LOSS OF THE SAMPLES DURING
  GRINDING
• THERE WILL HAVE SOME LOSS OF THE SAMPLES DURING
  FILTERING
• SOME OF THE ACTIVE INGEDIENT MAY NOT DISSOLVE IN
  WEAK ACID(0.1M)

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• THE INDICATOR CAN NOT INDICATE THE SMALL RANGE OF
  pH CHANGE
• HUMAN ERRORS
• THER WILL BE OTHER SUBSTANCE IN THE TABLET WHICH
  AFFECT THE EXPERIMENTAL RESULT

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PRECAUTIONS

• ACID IS CORROSIVE
• ALKALINE IS CORROSIVE

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CONCLUSION

• AFTER THE EXPERIMENT,WE CAN DETERMINE THAT THE
  NEUTRALIZING POWER OF 1 TABLET OF EACH SAMPLE,THE
  STRONGEST ONE IS WESIEN U ,THE SECOND IS TAITAN,
  AND THE WEAKEST IS HYDROSOIL.

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THE END

• THANK YOU VERY MUCH!!!!!

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