CH204_L03 - Why is it important to measure pH Historically...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Why is it important to measure pH? Historically it was all about food! Gardening/Agriculture Human Health/Physiology/Medicine Normal blood pH~7.35 Soil pH~5.5-7.5 for most plants pH of food influences taste, processing, stability (freshness).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Beckman Acidimeter 1934 1 st commercial pH meter pH is just a measure of H 3 O + concentration
Background image of page 2
pH is used to measure the relative strengths of acids and bases. Typically we express concentrations on log scale because it simplifies how we report the value.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Protic Acids and Bases Water can act as an acid or a base and undergoes self-ionization, known as autoprotolysis . Also referred to as an amphiprotic solvent. In pure water, only 1 water in 10 7 undergoes autoprotolysis. Other examples (conjugate pairs) Bronsted-Lowry definition: Acid- any substance that can donate a proton to a base Base- any substance that can accept a proton from an acid
Background image of page 4
Strength is dependent upon how much will dissociate in a solvent. Solvent is usually water! Strength of Acids and Bases Strong acids dissociate completely to give H 3 O +
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lab: Standardization of NaOH PURPOSE AND LEARNING OBJECTIVES ± To learn the technique of acid –base titrimetry ± To standardize a strong base solution (NaOH) to be used next week
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/28/2010 for the course CH 52470 taught by Professor Appling during the Spring '10 term at University of Texas.

Page1 / 16

CH204_L03 - Why is it important to measure pH Historically...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online