What are the other two independent other than concentration for reaction of hydrochloric acid with calcium carbonates. And what are thier control variable?

We don't know what the experiment is.

This is about rate of reaction btw.

The two independent variables, other than concentration, for the reaction of hydrochloric acid with calcium carbonate are temperature and surface area.

1. Temperature: This can be an independent variable as it can be changed and manipulated in the experiment. By altering the temperature, you can observe the effect on the rate of reaction. Higher temperatures generally increase the rate of reaction, while lower temperatures decrease it. The control variable for temperature would be to maintain a constant value throughout the experiment, either by using a water bath or a controlled heating source.

2. Surface area: In this case, the surface area of the calcium carbonate can be varied to investigate its effect on the rate of reaction. Grinding the calcium carbonate into smaller particles, resulting in a larger surface area, can accelerate the reaction rate. Conversely, using larger chunks or less granulated forms of calcium carbonate would decrease the reaction rate. The control variable for surface area would involve maintaining a constant size or form of calcium carbonate during the experiment.

It is important to note that other variables such as pressure and catalysts can also affect the reaction, but in the context of the question, they are not specified as the independent variables.

The two independent variables other than concentration that can affect the reaction between hydrochloric acid and calcium carbonate are temperature and surface area of the calcium carbonate.

Temperature: To investigate the effect of temperature, you can set up multiple reaction vessels containing the same concentration of hydrochloric acid and calcium carbonate, but at different temperatures. The temperature can be controlled using water baths or heating mantles. You would measure the volume of gas produced over a set period of time as an indication of reaction rate.

Surface area: To investigate the effect of surface area, you would use different forms of calcium carbonate with varying particle sizes. You can do this by using powdered, granulated, and solid pieces of calcium carbonate. All other experimental conditions, such as concentration and temperature, should remain constant. The reaction rate can be measured by the volume of gas evolved over time.

Control variables: In any experiment, it is important to identify and control variables that could influence the outcome. For the reaction between hydrochloric acid and calcium carbonate, the control variables would include the concentration of hydrochloric acid (which should remain constant), the pressure of the reaction system, and the presence of any catalysts. By keeping these variables constant, you can isolate and observe the effects of temperature and surface area on the reaction.