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State-of-the-Art pH Electrode Quality Control for Measurements of Acidic, Low Ionic Strength Waters.
Peer reviewedStapanian, Martin A.; Metcalf, Richard C. – Journal of Chemical Education, 1990
Described is the derivation of the relationship between the pH measurement error and the resulting percentage error in hydrogen ion concentration including the use of variable activity coefficients. The relative influence of the ionic strength of the solution on the percentage error is shown. (CW)
Descriptors: Chemical Analysis, Chemistry, College Science, Error of Measurement
Peer reviewedO'Reilly, James E. – Journal of Chemical Education, 1986
Outlines the simple exercise of measuring the length of an object as a concrete paradigm of the entire process of making chemical measurements and treating the resulting data. Discusses the procedure, significant figures, measurement error, spurious data, rejection of results, precision and accuracy, and student responses. (TW)
Descriptors: Chemistry, College Science, Error of Measurement, Higher Education
Download full textRiccobono, John; Henderson, Louise B.; Burkheimer, Graham J.; Place, Carol; Levinsohn, Jay R. – National Center for Education Statistics, 1981
The National Longitudinal Study (NLS) of the High School Class of 1972 is a large-scale long-term survey effort supported by the National Center for Education Statistics (NCES), Office of the Assistant Secretary for Educational Research and Improvement in the U.S. Department of Education. NLS is designed to provide statistics on a national sample…
Descriptors: Longitudinal Studies, National Surveys, Followup Studies, High School Graduates
