• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Calibration of pH Meter

Extracts from this document...

Introduction

Calibration of pH Meter Importing the concept of pH and the definition of pH - A measure of acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing more than 7 with increasing alkalinity and decreasing with increasing acidity of less than 7. The pH scale normally used ranges from 0 to 14). Certain chemical compounds release H + (hydrogen ions when in water) and other release OH - (hydroxide ions. The pH of a solution is the measurement of H+ or OH - in the solution exists. pH value of p (potential power) H (hydrogen, the logarithm of the reciprocal of the hydrogen ion concentration in gram atoms per litre. The pH scale is a logarithmic scale. ...read more.

Middle

Submerge the meter up to the cap line in the 7.0 calibration solution and adjust the screw labelled pH 7 on the top of the meter with a screwdriver until the meter reads 7.0. And rinsed the meter with distilled water and gently blot the end dry with a paper towel. Next, submerge the meter up to the cap line in the 4.0 calibration solution and adjust the screw labelled pH 4 on the top of the meter with a screwdriver until the meter reads 4.0. After calibrating the pH meter, I turned the meter off, replaced the cap, and discarded their calibration solution. I calibrated 0.25M and 1M of HCl to observe the accurate results from my practical experiment and the result I achieved are stated below in the table. ...read more.

Conclusion

Electrodes should be checked before use, and electrodes with low accuracy and precision are to be excluded from further use. If I not followed the addressed points below, I would have discovered an error. * Rinsing the electrodes with distilled water before placing in another solution. * Making sure the pH meter is up to date, e.g. Battery. * Stirring the solution in a circular motion with the pH meter. * Readings of pH or adjustment of the pH with the appropriate acid or base. * Allowing enough time for meter's reading to stabilise. A. The hydrogen ion concentration of a solution of pH 2.5 = 10-2.5 = 3.16�10-3 M B. The pH of 0.25M acid solution = -log (0.25) = 0.602pH C. The concentration of H+ ions in a solution of pH 1.0 pH = -log10 [H+] -1 = +log10 [H+] [H+] = 1�10-1 = 0.1M ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our AS and A Level Energy, Respiration & the Environment section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related AS and A Level Energy, Respiration & the Environment essays

  1. Marked by a teacher

    Effect of nitrate concentration on the growth of Duckweeds

    5 star(s)

    The Alternative Hypotheses of this experiment is : There will be a significant difference between the growth of the duckweeds fronds and the concentration of nitrates in the solution. The Null Hypotheses of this experiment is : There will be no significant difference between the growth of the duckweed fronds and the concentration of the nitrates in solution.

  2. the effect of bile concentration on the activity of the enzyme lipase during the ...

    Consequently this meant that for some of the experiment the pH might have been at optimum and for other it might have affected the enzyme in a negative way. Additionally because at higher concentration of bile salts, increasing the concentration does not affect the activity much, other limiting factor come

  1. Investigating the effects of Sodium Hydroxide concentration on Catalase

    have to know how much to use, too little and there be little or no reaction, or a very slow reaction, to much and it will be over to guick, it is also liver and hydroxide peroxide are very explosibe together, this could cause a problem as the reaction would

  2. the Effect of Copper Ions on a

    when using a spotting tile thus my end point decision making can be carried out thoughtfully providing me with more accurate results. Risk Assessment 1. CuSO4 is harmful if swallowed and may cause vomiting. Therefore hands must be washed after the experiment preventing the salt coming in contact with any food.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work