a) 2, 5, 5-Trimethyl-2-hexene Interpretation: The old name 2, 5, 5-trimethyl-2-hexene is to be changed to new, post-1993 name and its structure is to be given. Concept introduction: In 1993, The IUPAC changed its recommendations in naming the alkenes. As per the recommendations, the number indicating the position of double bond should be placed immediately before the – ene suffix instead of before the parent name. To change: The old name 2, 5, 5-trimethyl-2-hexene to the new, post-1993 name and to give its structure.

Question

A small artisanal cheesemaker is testing the acidity of their milk before it coagulates. During fermentation, bacteria produce lactic acid (K₁ = 1.4 x 104), a weak acid that helps to curdle the milk and develop flavor. The cheesemaker has measured that the developing mixture contains lactic acid at an initial concentration of 0.025 M. Your task is to calculate the pH of this mixture and determine whether it meets the required acidity for proper cheese development. To achieve the best flavor, texture and reduce/control microbial growth, the pH range needs to be between pH 4.6 and 5.0. Assumptions: Lactic acid is a monoprotic acid H H :0:0: H-C-C H :0: O-H Figure 1: Lewis Structure for Lactic Acid For simplicity, you can use the generic formula HA to represent the acid You can assume lactic acid dissociation is in water as milk is mostly water. Temperature is 25°C 1. Write the K, expression for the dissociation of lactic acid in the space provided. Do not forget to include state symbols.…

Answer 1

Question

Chapter 7.3, Problem 7P

Interpretation Introduction

a) 2, 5, 5-Trimethyl-2-hexene

Interpretation:

The old name 2, 5, 5-trimethyl-2-hexene is to be changed to new, post-1993 name and its structure is to be given.

Concept introduction:

In 1993, The IUPAC changed its recommendations in naming the alkenes. As per the recommendations, the number indicating the position of double bond should be placed immediately before the – ene suffix instead of before the parent name.

To change:

The old name 2, 5, 5-trimethyl-2-hexene to the new, post-1993 name and to give its structure.

Interpretation Introduction

b) 2, 3-Dimethyl-1, 3-cyclohexadiene

Interpretation:

The old name 2, 3-dimethyl-1, 3-cyclohexadiene is to be changed to new, post-1993 name and its structure is to be given.

Concept introduction:

In 1993, The IUPAC changed its recommendations in naming the alkenes. As per the recommendations, the number indicating the position of double bond should be placed immediately before the – ene suffix instead of before the parent name.

To change:

The old name 2, 3-dimethyl-1, 3-cyclohexadiene to the new, post-1993 name and to give its structure.

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