The ph after 17.0 ml of 0.15 m Koh has been added to 15 ml of 0.20 m hclo4 is  <u>3.347</u>.
Titration is a commonplace laboratory technique of quantitative chemical analysis to determine the attention of an identified analyte. A reagent, termed the titrant or titrator, is ready as a trendy answer of recognized awareness and extent.
<u>Calculation:-</u>
Normality of acid                                                Normality of base
= nMV                                                                        nMV
= 1 × 0. 15 × 0.017                                              1 ×  0. 20 ×0.015 L
= 2.55 × 10⁻³                                                             = 3 × 10⁻³
The overall base will be high
net concentration = 3× 10⁻³ - 2.55 × 10⁻³
                              = 0.45 × 10⁻³
                              = 4.5× 10⁻⁴
pH = -log[4.5 × 10⁻⁴]
     = 4 - log4.4
      = <u>3.347</u> 
A titration is defined as 'the manner of determining the amount of a substance A by using adding measured increments of substance B, the titrant, with which it reacts till precise chemical equivalence is completed the equivalence factor.
Learn more about titration here:-brainly.com/question/186765
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For many solids<span> dissolved in </span>liquid<span> water, the </span>solubility <span>increases with </span>temperature<span>.</span>
        
                    
             
        
        
        
Answer:
Prokaryotes are unicellular organisms that lack membrane-bound structures, the most noteworthy of which is the nucleus. ... While prokaryotic cells do not have membrane-bound structures, they do have distinct cellular regions. In prokaryotic cells, DNA bundles together in a region called the nucleoid.
 
        
             
        
        
        
Physical change- evaporation , condensation
Chemical change- combustion , neutralization
        
             
        
        
        
IM THINKING THEY BELONG IN THIS CLASS OF ELEMENTS VILL B.
Hope i Helped