which of the following occurs when a sample of 0.1M HNO3 is tested?
a) phenolphthalein turns pink
b) bromthymol blue turns yellow
c) Ca9s) reacts and produces CO2 (g)
d) Na (s) reacts and rpoduces NO2 (g)
I believe bromthymol blue will turn yellow with HNO2. I can't read c. Both a and d are false.
c) Ca (s) reacts and produces Co2(g)
Can you explain to me why it's b please?
Nevermind, I think I understand it now.
Thanks.
To determine the behavior of a solution of 0.1M HNO3, we need to analyze the properties of this compound.
HNO3 is the chemical formula for nitric acid, which is a strong acid. When dissolved in water, it ionizes completely to release hydrogen ions (H+) and nitrate ions (NO3-).
Given the options provided, let's evaluate each statement:
a) "Phenolphthalein turns pink": Phenolphthalein is an indicator that changes color in response to a change in pH. However, for a strong acid like HNO3, the solution will already be acidic (low pH), so phenolphthalein will not change color to pink.
b) "Bromthymol blue turns yellow": Bromthymol blue is another pH indicator. It is typically blue in a neutral or basic solution, and changes to yellow in an acidic solution. Since HNO3 is a strong acid, it will increase the acidity of the solution, causing bromthymol blue to turn yellow.
c) "Ca (s) reacts and produces CO2 (g)": Calcium (Ca) is a metal, and it will generally react with acids to produce hydrogen gas (H2), not carbon dioxide (CO2). Therefore, this statement is not accurate.
d) "Na (s) reacts and produces NO2 (g)": Sodium (Na) is also a metal, but it does not react with HNO3 to produce NO2 gas. Instead, it would react with nitric acid to produce sodium nitrate (NaNO3) and release hydrogen gas (H2).
Based on the explanation above, the correct answer is b) "Bromthymol blue turns yellow."