Answer:
Neutralization equation:
HCl + NaOH → NaCl + H₂O + Heat
Heat would calculated through,
Q = m . c. ΔT
Explanation:
When aqueous sodium hydroxide and hydrochloric acid react with each other a neutralization reaction occur. It produces water and salt. The salt would be sodium chloride.
Chemical equation:
HCl + NaOH → NaCl + H₂O + Heat
The heat produces can be calculated through the given formula.
Q = m . c. ΔT
Q = amount of heat produces
m = total mass of solution
ΔT = change in temperature of solution
C = specific heat capacity of solution
As the mostly solutions are water so we take the specific heat capacity of water which is 4.186 j/g .°C
The concentration after dilution is 1.4%.
We are aware that concentration and volume are related to each other by the formula -
= 
, where we have initial concentration and volume on Left Hand Side and final concentration and volume on Right Hand Side.
Keep the values to calculate final concentration.
= (53.5 × 5.4)/205.0
Performing multiplication on Right and Side
= 288.9/205.0
Performing division on Right Hand Side
= 1.4%
Hence, the final concentration is 1.4%.
Learn more about concentration -
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The complete question is -
A 53.5 mL sample of an 5.4 % (m/v) KBr solution is diluted with water so that the final volume is 205.0 mL.
Calculate the final concentration and express your answer to two significant figures and include the appropriate units.
Answer:
i would say the the first 1
Explanation:
The density of a material is its unique property by which a unknown material can be identified and also the impurity (if present) in a material can be concluded. Mathematically the density can be expressed as-
. Thus from the mathematical expression we can say that the density is the mass per unit volume of a material. Here the density of ethanol is given 0.789 g/mL. Thus the weight of the 1 mL ethanol is 0.789g. Thus the weight of the 125 mL of ethanol will be (125×0.789) = 98.625 g.
