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.
Market research has an expiry date: it is challenging to keep it up to date and contemporary, especially in a fast moving market place Primary Market Research Limitations Primary research is research collected directly from the research subject during activities such as observations, focus groups and interviews.