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.
Researchers who do this have specific work-health questions in mind that theyâd like answered. The answers â or data â used from the responses are called primary data. Other Institute projects involve using data that has already been gathered by someone else, such as survey information from the Canadian Census.