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How can calcium hydroxide be used to test for carbon dioxide?
Calcium hydroxide can be dissolved to create a saturated aqueous solution, which is sometimes referred to as limewater. When carbon dioxide is bubbled through the limewater, the carbon dioxide reacts with water to form carbonic acid. The carbonic acid is first deprotonated to form a bicarbonate anion, which is then deprotonated once more to form the carbonate anion. The carbonate anion then reacts with a calcium cation to form calcium carbonate (the compound in limestone). Calcium carbonate is insoluble in water, and thus precipitates out. The formerly clear limewater solution has thus become cloudy, giving an indication that carbon dioxide is likely present. Reaction scheme is given below: CO2(g) + H2O --> H2CO3 H2CO3 + OH- --> HCO3-+ H2O HCO3- + OH- --> CO32- H2O CO32- + Ca2+ --> CaCO3(S) Note that if too much carbon dioxide is added or too little calcium hydroxide is used, then calcium bicarbonate will form instead of calcium carbonate. Calcium bicarbonate is water soluble, and thus will appear to produce a negative test.
Reason why calcium hydroxide is used to detect carbon iv oxide while potassium hydroxide solution is not?
Both hydroxides will react with carbon dioxide to form their respective carbonates. Calcium carbonate is largely insoluble in water and so it will form a visible solid precipitate. Potassium carbonate is soluble in water, so there will be no visible change to the solution.
What is the solution used to detect the presence of CO2?
Calcium hydroxide solution is used to detect the presence of carbon bi oxide. When carbon bi oxide is passed through the solution of calcium hydroxide, it turns milky white. There is formation of calcium carbonate particle. This is what was taught to me as a kid in my school.
What are hetrogeneous substance?
Heterogeneous Substance is mixture. The mixture is made of two different parts that you can detect quite easily.
A scientist suspect that a mineral sample is a carbonate. which useful for identifying the sample as a carbonate?
To identify the mineral sample as a carbonate, the scientist can perform an acid test. If the sample fizzes or produces bubbles when acid is added, it indicates the presence of carbonate minerals. Additionally, spectroscopic analysis can be used to detect the specific chemical composition of the mineral, confirming its classification as a carbonate.
What happend when you mix carbon dioxide with lime water?
Lime water reacts with carbon dioxide to produce a precipitate of calcium carbonate (CaCO3): Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l) As you can see, it also produces water (H20). Thus, lime water can be used to detect the presence of carbon dioxide.
What is the effect of bicarbonate indicator?
Bicarbonate indicator is used to detect the presence of carbon dioxide in a solution. It changes color in the presence of carbon dioxide, indicating the formation of carbonic acid. This can be useful in various applications, such as in the identification of respiratory gas exchange in biological systems.
What turns lime water milky?
When carbon dioxide is passed through lime water (calcium hydroxide solution), it reacts with the calcium hydroxide to form calcium carbonate, which is insoluble in water. This reaction results in the formation of a white precipitate, which gives lime water a milky appearance. This test is commonly used to detect the presence of carbon dioxide gas.
What happens when solution of slaked lime is exposed to air?
Slaked Lime is Calcium Hydroxide [also known as Lime Water] Lime Water is used to detect the presence of Carbon Dioxide: Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l) Calcium Carbonate [Chalk: CaCO3] is insoluble in water and so is deposited as a precipitate upon completion of the reaction: The Lime Water turns 'chalky'
What is the property of a limewater?
Limewater is a saturated aqueous solution of calcium hydroxide. It is used to detect the presence of carbon dioxide by turning milky white due to the formation of calcium carbonate. This property makes it useful in various applications such as in agriculture to test for soil acidity and in medicine to treat indigestion.
What is gallium carbonate used for?
Gallium carbonate is used in some medical imaging procedures, specifically for PET scans. It is a radiopharmaceutical agent that helps to detect and diagnose certain types of cancers, particularly neuroendocrine tumors. Gallium carbonate is injected into the body and travels to areas of abnormal cell activity, allowing for the detection of tumors.
What can you see in limewater if there is oxygen in it?
If there is oxygen in limewater, it would stay clear. Limewater (calcium hydroxide solution) is typically used to detect the presence of carbon dioxide. If carbon dioxide is present, it forms a white precipitate of calcium carbonate, turning the limewater cloudy or milky.
