A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually. Hence, a pH indicator is a chemical detector for hydronium ions (H3O+) or hydrogen ions (H+) in the Arrhenius model. Normally, the indicator causes the color of the solution to change depending on the pH. Indicators can also show change in other physical properties; for example, olfactory indicators show change in their odor. The pH value of a neutral solution is 7.0.
Primary research consists of a collection of original primary data collected by the researcher.It is often undertaken after the researcher has gained some insight into the issue by reviewing secondary research or by analyzing previously collected primary data.he term primary research is widely used in academic research, market research and competitive intelligence. There are advantages and disadvantages to primary research. Advantages: 1  Researcher can focus on both qualitative and quantitative issues.
Research is related to the aspiration and objectives are related to the battle-plan. Objectives should be specific, measurable, achievable, realistic and timely, so that research problem could be explored effectively. Specific: Objective should be clear and well defined. It helps to specify the research problems and provide proper guideline to find the solution of research problem (Alexander, 2008). Specific objective identify the methods of collecting necessary information related to the research problem.