In our 2004 survey, 65 percent accepted the sentence Pressure to marry may cause precipitous decision-making that is not grounded in the reality of who you are and what you want from life.įarlex Trivia Dictionary. In fact, a majority of the Usage Panel now accepts this usage. Definition of PRECIPITATE (verb): make something suddenly happen or start existing solid substance: become separate from liquid fall or be thrown. After all a precipitous increase in reports of measles is also an abrupt or sudden event. Many people object to this usage out of a desire to keep precipitate and precipitous distinct, but the extension of meaning from 'steep' to 'abrupt' is perfectly natural.

But precipitous and precipitously are also frequently used to mean 'abrupt, hasty,' which takes them into territory that would ordinarily belong to precipitate and precipitately: their precipitous decision to leave. Precipitous currently means 'steep' in both literal and figurative senses: the precipitous rapids of the upper river a precipitous drop in commodity prices.

Usage Note: The adjective precipitate and the adverb precipitately were once applied to physical steepness but are now used primarily of rash, headlong actions: Their precipitate entry into the foreign markets led to disaster. The SOLUBLE chemicals are Sr(OH) 2 and HgC 2H 3O 2 and Sr(C 2H 3O 2) 2.

Sr(OH) 2(aq) + 2 HgC 2 H 3 O 2(aq) -> 2 HgOH (s) + Sr(C 2 H 3 O 2 ) 2(aq)Īnswer: The PRECIPITANT and INSOLUBLE chemical is HgOH. The SOLUBLE chemicals are CrBr 3 and (NH 4) 2S and NH 4Br. Ģ CrBr 3(aq) + 3 (NH 4 ) 2 S (aq) -> 6 NH 4 Br (aq) + Cr 2 S 3(s)Īnswer: The PRECIPITANT and INSOLUBLE chemical is Cr 2S 3. The SOLUBLE chemicals are CaCl 2 and Rb 2CO 3 and RbCl. Use the solubility picture if needed.ĬaCl 2(aq) + Rb 2 CO 3(aq) -> CaCO 3(s) + 2 RbCl (aq)Īnswer: The PRECIPITANT and INSOLUBLE chemical is CaCO 3. PRACTICE PROBLEMS : Determine which chemicals are the PRECIPITANT which are INSOLUBLE, and which are SOLUBLE in the balanced chemical equations below. The SOLUBLE chemicals are MgSO 3 and K 3 PO 4 and K 2 (SO 3 ). ģ MgSO 3(aq) + 2 K 3 PO 4(aq) -> 3 K 2 (SO 3 ) (aq) + Mg 3 (PO 4 ) 2(s)Īnswer: The PRECIPITANT and INSOLUBLE chemical is Mg 3 (PO 4 ) 2. The SOLUBLE chemicals are NaCl and Na 3 PO 4 and CaCl 2. Precipitation is a chemical reaction that is known to occur within an aqueous solution when two ions bond together, forming an insoluble salt. VIDEO Precipitant Examples 1.Ģ Na 3 PO 4(aq) + 3 CaCl 2(aq) -> Ca 3 (PO 4 ) 2(s) + 6 NaCl (aq)Īnswer: The PRECIPITANT and INSOLUBLE chemical is Ca 3 (PO 4 ) 2. All the words or symbols in BLUE mean the same and all the words or symbols in RED mean the opposite of the blue.Įxamples: Determine which chemicals are the PRECIPITANT which are INSOLUBLE, and which are SOLUBLE in the balanced chemical equations below. I have arranged how I want you to think about these words in a small table below. The words you will be using to describe the chemical equations are PRECIPITANT, SOLID, INSOLUBLE, AQUEOUS, and SOLUBLE. In this section, you want to be able use definitions to describe the different parts and states in the chemicals equations. The example means that one solution containing KOH in one cup and another solution containing Fe 2(SO 4) 3 in a completely separate cup are poured together into a container to create the solid precipitate Fe(OH) 3 and an aqueous solution of K 2SO 4. An example of how this precipitant is written in a balanced chemical equation is given below:Ħ KOH (aq) + Fe 2(SO 4) 3(aq) –-> 2 Fe(OH) 3(s) + 3 K 2SO 4(aq) This solid compound or molecule that forms can also be referred to as the precipitant. Instead we often talk about two different aqueous solutions coming together in one container and how those two solutions may cause solid compounds or molecules to form. In the case of water in the air the process can also be called condensation, which we talked about in a previous lesson.įor the purposes of chemistry classes we do not usually talk about precipitation happening in the form of rain.

They mean the chance it will rain or fog or cause dew to form on your car. Your local weather person will always talk about the chance for precipitation. The most common way you see precipitation is when water molecules in the gas state collect into clouds and then change to liquid water in the form of rain. The change of state will happen when you get a change of conditions (either a change of temperature, pressure, or having chemicals added to it). It is the act of one substance changing state and therefore removing itself from the solution / mixture.

Define precipitate chemistry terms