What do they mean? A negative concentration value indicates that the sample was analyzed but that the concentration was below the determination limits of the analytical method.
Can you have a negative concentration?
It is not possible for concentration values to be negative. As it is not possible to have negative quantities in the values used to calculate the concentration, the concentration can never be negative.
Can you have negative molarity?
Popular Answers (1) The negative concentration values are not useful, but the actual concentrations may be greater than zero. The negative values you calculated just indicate that the actual concentration of your samples lies below the lower end of your standard curve.
How do you know if a reaction is zero order?
How do you know if it’s a Zero Order Reaction? If the reactant concentration increases, the reaction has zero-order kinetics. It has first-order kinetics if it has no effect. The reaction has second-order kinetics if increasing the reactant decreases the half life.
Is concentration always positive?
We can get the negative concentration values sometimes but they are not very useful, In actual the concentrations may be greater than zero. In literature, it can be seen that the negative values calculated, shows that the actual concentration of your sample lies below the lower end of your standard curve.
Can absorbance be negative?
Negative Absorbance Readings Sample measurements read negative absorbance for the following reasons: The absorbance value of the reference is higher than the sample. The reference and the sample are interchanged. The sample is very dilute and close to the absorbance of the reference.
Is it possible to have a negative pH?
Can You Detect A Negative pH? While the pH scale typically runs from 0 to 14, it is definitely possible to calculate a negative pH. A negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1 N (Normality).
Can an acid have a negative pH?
In practice, any acid that yields a concentration of hydrogen ions with a molarity greater than 1 will be calculated to have a negative pH. For example, the pH of 12M HCl (hydrochloric acid) is calculated to be -log(12) = -1.08. But, you can’t measure it with an instrument or test.
What is the highest molarity possible?
1 Answer. Ernest Z. The maximum molality is 52.8 m. In practical terms, the highest molarity for aqueous solutions is that of the solvent itself, water.
Is Molality negative or positive?
( molality = moles of solute / kg of solvent.) Kf is the freezing point depression constant and has a positive sign. i is the van’t Hoff factor, or the effective number of particles each solute particle dissociates to give, which can account for ion pairing in more precise work.
Can moles be negative chemistry?
mol have a negative 1 (g. mol^ Answer: means the same as g/mol. The negative 1 exponent is just a mathematical way to describe a quantity that is divided by some other one.
Can you have a pH less than 0?
The neutral value of the pH depends on the temperature – being lower than 7 if the temperature increases above 25 °C. The pH value can be less than 0 for very concentrated strong acids, or greater than 14 for very concentrated strong bases.
Can order of reaction be negative?
Order of reaction can be negative integer – Negative integer value of order of reaction indicates that the concentration of the reactants inversely affects the rate of a reaction.
What is a 0 order reaction?
Definition of zero-order reaction : a chemical reaction in which the rate of reaction is constant and independent of the concentration of the reacting substances — compare order of a reaction.
What is zero order and first order reaction?
A zero-order reaction proceeds at a constant rate. A first-order reaction rate depends on the concentration of one of the reactants. A second-order reaction rate is proportional to the square of the concentration of a reactant or the product of the concentration of two reactants.
Can the equilibrium constant be negative?
The equilibrium constant can never be negative. The equilibrium constant expression is k=[products]/[reactants]. The concentrations of products and reactants will always be positive, making the equilibrium constant positive. Therefore, it can’t be negative and the answer would be false.
How will you know if a solution is concentrated?
A concentrated solution is one that has a relatively large amount of dissolved solute. A dilute solution is one that has a relatively small amount of dissolved solute.
How do you determine concentration?
Divide the mass of the solute by the total volume of the solution. Write out the equation C = m/V, where m is the mass of the solute and V is the total volume of the solution. Plug in the values you found for the mass and volume, and divide them to find the concentration of your solution.
What does negative absorbance reading mean?
A negative absorbance means that the the intensity of light passing through the sample is greater than the intensity of light passing through the reference.
What is negative absorption?
Negative Net Absorption means that more commercial space was vacated/supplied in a particular market than what was leased or absorbed by commercial tenants. Under negative Net Absorption scenario, the commercial rents would tend to fall or cool down.
What is negative adsorption?
In some cases, the solvent from the solution may be adsorbed by the adsorbent so that the concentration of the solution increases than the initial concentration. This is called negative adsorption.
What does a pH of 0 mean?
A solution that has a pH of 0 is very acidic with a high concentration of hydrogen ions (although things can be of greater acidity), a pH of 7 is a neutral solution, equal concentrations of hydrogen ions and their basic counterpart hydroxy ions.
What’s the lowest pH possible?
The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
What is the lowest pH ever recorded?
The pH values recorded here are the lowest yet reported anywhere that we know of for any acid mine water. The lowest pH of -3.6 is the lowest known for any water in the environment.
Are bases negative or positive?
The strength of a base depends on its ability to attract and hold a proton. Therefore bases often have negative charges, and they invariably have at least one lone pair of electrons which can form a coordinate covalent bond to a proton.