*24-1.In a solution of pH5.3 the indicator bromocresol purple exhibits a yellow color, but when the pH is 6.0, the indicator solution changes to purple. Discuss why these colors are observed in terms of the wave- length regions and colors absorbed and transmitted.

The colors observed with bromocresol purple in different pH levels can be explained by the concept of acid-base indicators and their behavior in response to changes in pH. Bromocresol purple is a pH indicator that changes color based on the hydrogen ion concentration in a solution.<br /><br />At pH 5.3, the solution is acidic, and the indicator bromocresol purple exhibits a yellow color. This is because the acidic environment causes the indicator to absorb light in the blue region of the visible spectrum and transmit light in the yellow region. The yellow color is observed because it is the color that is transmitted and perceived by our eyes.<br /><br />When the pH increases to 6.0, the solution becomes slightly less acidic. In this pH range, the indicator bromocresol purple changes to a purple color. This color change occurs because the indicator absorbs light in the yellow region and transmits light in the purple region. The purple color is observed because it is the color that is transmitted and perceived by our eyes.<br /><br />In summary, the colors observed with bromocresol purple in different pH levels are due to the absorption and transmission of specific wavelengths of light by the indicator. The indicator absorbs light in different regions of the visible spectrum depending on the pH of the solution, and the transmitted light is perceived as the observed color.