Suggest other suitable indicators for determination of calcium trioxocarbonate (iv) content in chalk by back titration
First, you should know that calcium trioxocarbonate (iv) is not an IUPAC name for CaCO3.
Second, "other" suitable indicators means what? What indicator(s) have you already used or suggested. The indicator you use depends somewhat on the acid used and what base you back titrate with.
To determine the calcium trioxocarbonate (IV) content in chalk by back titration, there are a few suitable indicators that you can use. Here are some options:
1. Methyl Orange: Methyl orange can be used as an indicator in back titrations. It is yellow in an acidic solution and red in an alkaline solution. When you neutralize the excess acid by adding a base (in this case, sodium hydroxide), the solution will change from yellow to red. This color change indicates the endpoint of the back titration.
2. Phenolphthalein: Phenolphthalein is another commonly used indicator in back titrations. It is colorless in acidic solutions and turns pink in alkaline solutions. As you titrate the excess acid with a base, the phenolphthalein will transition from colorless to pink, signaling the endpoint of the reaction.
3. Bromothymol Blue: Bromothymol blue is a pH indicator that can be useful in determining the endpoint of a back titration. It is yellow in acidic solutions and blue in alkaline solutions. As the excess acid is titrated with a base, the bromothymol blue will change from yellow to blue, indicating the endpoint.
Remember, when performing a back titration, you first react the chalk with an excess of a strong acid, allowing the calcium trioxocarbonate (IV) to react and form a solution. Then, you back titrate the unreacted acid with a base, using an indicator to determine the endpoint.